PM> Install-Package Spire.PDF

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;

namespace DeleteBlankPage
{
    class Program
    {
        static void Main(string[] args)
        {
            //Apply license by license key
            Spire.License.LicenseProvider.SetLicenseKey("your license key");

            //Create a PdfDocument instance
            PdfDocument document = new PdfDocument();

            //Load a sample PDF document
            document.LoadFromFile("input.pdf");

            //Loop through all pages in the PDF
            for (int i = document.Pages.Count - 1; i >= 0; i--)
            {
                //Detect if a page is blank
                if (document.Pages[i].IsBlank())
                {
                    //Remove the absolutely blank page
                    document.Pages.RemoveAt(i);
                }
                else
                {
                    //Save PDF page as image
                    Image image = document.SaveAsImage(i, PdfImageType.Bitmap);

                    //Detect if the converted image is blank
                    if (IsImageBlank(image))
                    {
                        //Remove the page
                        document.Pages.RemoveAt(i);
                    }
                }
            }

            //Save the result document
            document.SaveToFile("RemoveBlankPage.pdf", FileFormat.PDF);
        }

        //Detect if an image is blank
        public static bool IsImageBlank(Image image)
        {
            Bitmap bitmap = new Bitmap(image);
            for (int i = 0; i < bitmap.Width; i++)
            {
                for (int j = 0; j < bitmap.Height; j++)
                {
                    Color pixel = bitmap.GetPixel(i, j);
                    if (pixel.R < 240 || pixel.G < 240 || pixel.B < 240)
                    {
                        return false;
                    }
                }
            }
            return true;
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.Graphics

Namespace DeleteBlankPage
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            'Apply license by license key
            Spire.License.LicenseProvider.SetLicenseKey("your license key")

            'Create a PdfDocument instance
            Dim document As PdfDocument = New PdfDocument

            'Load a sample PDF document
            document.LoadFromFile("input.pdf")

            'Loop through all pages in the PDF
            Dim i As Integer = (document.Pages.Count - 1)
            Do While (i >= 0)

                'Detect if a page is blank
                If document.Pages(i).IsBlank Then

                    'Remove the absolutely blank page
                    document.Pages.RemoveAt(i)
                Else

                    'Save PDF page as image
                    Dim image As Image = document.SaveAsImage(i, PdfImageType.Bitmap)

                    'Detect if the converted image is blank
                    If Program.IsImageBlank(image) Then

                        'Remove the page
                        document.Pages.RemoveAt(i)
                    End If

                End If

                i = (i - 1)
            Loop

            'Save the result document
            document.SaveToFile("RemoveBlankPage.pdf", FileFormat.PDF)
        End Sub

        'Detect if an image is blank
        Public Shared Function IsImageBlank(ByVal image As Image) As Boolean
            Dim bitmap As Bitmap = New Bitmap(image)
            Dim i As Integer = 0
            Do While (i < bitmap.Width)
                Dim j As Integer = 0
                Do While (j < bitmap.Height)
                    Dim pixel As Color = bitmap.GetPixel(i, j)
                    If ((pixel.R < 240) _
                                OrElse ((pixel.G < 240) _
                                OrElse (pixel.B < 240))) Then
                        Return False
                    End If

                    j = (j + 1)
                Loop

                i = (i + 1)
            Loop

            Return True
        End Function
    End Class
End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;

namespace ConvertPDFVersion
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument pdf = new PdfDocument();

            //Load a sample PDF file
            pdf.LoadFromFile("sample.pdf");

            //Change the PDF to version 1.7
            pdf.FileInfo.Version = PdfVersion.Version1_7;

            //Save the result file
            pdf.SaveToFile("PDFVersion.pdf");
        }
    }
}

Imports Spire.PDF

Namespace ConvertPDFVersion
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim pdf As PdfDocument = New PdfDocument

            'Load a sample PDF file
            pdf.LoadFromFile("sample.pdf")

            'Change the PDF to version 1.7
            pdf.FileInfo.Version = PdfVersion.Version1_7

            'Save the result file
            pdf.SaveToFile("PDFVersion.pdf")
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.PDF

using System;
using Spire.Pdf;

namespace MergePDFs
{
    class Program
    {
        static void Main(string[] args)
        {
            //Get the paths of the documents to be merged
            String[] files = new String[] {
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-1.pdf",
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-2.pdf",
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-3.pdf"};

            //Merge these documents and return an object of PdfDocumentBase
            PdfDocumentBase doc = PdfDocument.MergeFiles(files);

            //Save the result to a PDF file
            doc.Save("output.pdf", FileFormat.PDF);
        }
    }
}

Imports System
Imports Spire.Pdf
 
Namespace MergePDFs
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Get the paths of the documents to be merged
            Dim files() As String =  New String() {"C:\\Users\\Administrator\\Desktop\\PDFs\\sample-1.pdf","C:\\Users\\Administrator\\Desktop\\PDFs\\sample-2.pdf","C:\\Users\\Administrator\\Desktop\\PDFs\\sample-3.pdf"}

 
            'Merge these documents and return an object of PdfDocumentBase
            Dim doc As PdfDocumentBase =  PdfDocument.MergeFiles(files) 
 
            'Save the result to a PDF file
            doc.Save("output.pdf", FileFormat.PDF)
        End Sub
    End Class
End Namespace

using System;
using Spire.Pdf;

namespace MergeSelectedPages
{
    class Program
    {
        static void Main(string[] args)
        {
            //Get the paths of the documents to be merged
            String[] files = new String[] {
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-1.pdf",
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-2.pdf",
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-3.pdf"};

            //Create an array of PdfDocument
            PdfDocument[] docs = new PdfDocument[files.Length];

            //Loop through the documents
            for (int i = 0; i < files.Length; i++)
            {
                //Load a specific document
                docs[i] = new PdfDocument(files[i]);
            }

            //Create a PdfDocument object for generating a new PDF document
            PdfDocument doc = new PdfDocument();

            //Insert the selected pages from different documents to the new document
            doc.InsertPage(docs[0], 0);
            doc.InsertPageRange(docs[1], 1,3);
            doc.InsertPage(docs[2], 0);

            //Save the document to a PDF file
            doc.SaveToFile("output.pdf");
        }
    }
}

Imports System
Imports Spire.Pdf
 
Namespace MergeSelectedPages
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Get the paths of the documents to be merged
            Dim files() As String =  New String() {"C:\\Users\\Administrator\\Desktop\\PDFs\\sample-1.pdf","C:\\Users\\Administrator\\Desktop\\PDFs\\sample-2.pdf","C:\\Users\\Administrator\\Desktop\\PDFs\\sample-3.pdf"}

 
            'Create an array of PdfDocument
            Dim docs() As PdfDocument =  New PdfDocument(files.Length) {} 
 
            'Loop through the documents
            Dim i As Integer
            For  i = 0 To  files.Length- 1  Step  i + 1
                'Load a specific document
                docs(i) = New PdfDocument(files(i))
            Next
 
            'Create a PdfDocument object for generating a new PDF document
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Insert the selected pages from different documents to the new document
            doc.InsertPage(docs(0), 0)
            doc.InsertPageRange(docs(1), 1,3)
            doc.InsertPage(docs(2), 0)
 
            'Save the document to a PDF file
            doc.SaveToFile("output.pdf")
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.PDF

using System;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Lists;

namespace CreateOrderedList
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Set the margins
            PdfMargins margins = new PdfMargins(30);

            //Add a page
            PdfPageBase page = doc.Pages.Add(PdfPageSize.A4, margins);

            //Create a brush
            PdfBrush brush = PdfBrushes.Black;

            //Create fonts
            PdfFont titleFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Bold);
            PdfFont listFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Regular);

            //Create a maker for ordered list
            PdfOrderedMarker marker = new PdfOrderedMarker(PdfNumberStyle.LowerLatin, listFont);

            //Specify the initial coordinate
            float x = 10;
            float y = 20;

            //Draw title
            String title = "Required Web Development Skills:";
            page.Canvas.DrawString(title, titleFont, brush, x, y);
            y = y + (float)titleFont.MeasureString(title).Height;
            y = y + 5;


            //Create a numbered list
            String listContent = "Command-line Unix\n"
                + "Vim\n"
                + "HTML\n"
                + "CSS\n"
                + "Python\n"
                + "JavaScript\n"
                + "SQL";
            PdfSortedList list = new PdfSortedList(listContent);

            //Set the font, indent, text indent, brush of the list
            list.Font = listFont;
            list.Indent = 2;
            list.TextIndent = 4;
            list.Brush = brush;
            list.Marker = marker;

            //Draw list on the page at the specified location
            list.Draw(page, x, y);

            //Save to file
            doc.SaveToFile("OrderedList.pdf");
        }
    }
}

Imports System
Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Lists
 
Namespace CreateOrderedList
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Set the margins
            Dim margins As PdfMargins =  New PdfMargins(30) 
 
            'Add a page
            Dim page As PdfPageBase =  doc.Pages.Add(PdfPageSize.A4,margins) 
 
            'Create a brush
            Dim brush As PdfBrush =  PdfBrushes.Black 
 
            'Create fonts
            Dim titleFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Bold) 
            Dim listFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Regular) 
 
            'Create a maker for ordered list
            Dim marker As PdfOrderedMarker =  New PdfOrderedMarker(PdfNumberStyle.LowerLatin,listFont) 
 
            'Specify the initial coordinate
            Dim x As single =  10 
            Dim y As single =  20 
 
            'Draw title
            Dim title As String =  "Required Web Development Skills:" 
            page.Canvas.DrawString(title, titleFont, brush, x, y)
            y = y + CType(titleFont.MeasureString(title).Height, single)
            y = y + 5
 
            'Create a numbered list
            String listContent = "Command-line Unix\n"
                + "Vim\n"
                + "HTML\n"
                + "CSS\n"
                + "Python\n"
                + "JavaScript\n"
                Dim "SQL" As +
            Dim list As PdfSortedList =  New PdfSortedList(listContent) 
 
            'Set the font, indent, text indent, brush of the list
            list.Font = listFont
            list.Indent = 2
            list.TextIndent = 4
            list.Brush = brush
            list.Marker = marker
 
            'Draw list on the page at the specified location
            list.Draw(page, x, y)
 
            'Save to file
            doc.SaveToFile("OrderedList.pdf")
        End Sub
    End Class
End Namespace

using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Lists;
using System;

namespace CreateBulletedList
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Set the margin
            PdfMargins margin = new PdfMargins(30);

            //Add a page
            PdfPageBase page = doc.Pages.Add(PdfPageSize.A4, margin);

            //Create fonts
            PdfFont titleFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Bold);
            PdfFont listFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Regular);
            PdfFont markerFont = new PdfFont(PdfFontFamily.TimesRoman, 6f, PdfFontStyle.Regular);

            //Create a brush
            PdfBrush brush = PdfBrushes.Black;

            //Specify the initial coordinate
            float x = 10;
            float y = 20;

            //Draw title
            String title = "Computer Science Subjects:";
            page.Canvas.DrawString(title, titleFont, brush, x, y);
            y = y + (float)titleFont.MeasureString(title).Height;
            y = y + 5;

            //Specify the marker style
            PdfMarker marker = new PdfMarker(PdfUnorderedMarkerStyle.Asterisk);
            marker.Font = markerFont;

            //Create an unordered list
            String listContent = "Data Structure\n"
                    + "Algorithm\n"
                    + "Computer Networks\n"
                    + "Operating System\n"
                    + "Theory of Computations\n"
                    + "C Programming\n"
                    +"Computer Organization and Architecture"; 

            PdfList list = new PdfList(listContent);

            //Set the font, indent, text indent, brush, maker of the list
            list.Font = listFont;
            list.Indent = 2;
            list.TextIndent = 4;
            list.Brush = brush;
            list.Marker = marker;

            //Draw list on a page at the specified location
            list.Draw(page, x, y);

            //Save to file
            doc.SaveToFile("UnorderedList.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Lists
Imports System
 
Namespace CreateBulletedList
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Set the margin
            Dim margin As PdfMargins =  New PdfMargins(30) 
 
            'Add a page
            Dim page As PdfPageBase =  doc.Pages.Add(PdfPageSize.A4,margin) 
 
            'Create fonts
            Dim titleFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Bold) 
            Dim listFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Regular) 
            Dim markerFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,6f,PdfFontStyle.Regular) 
 
            'Create a brush
            Dim brush As PdfBrush =  PdfBrushes.Black 
 
            'Specify the initial coordinate
            Dim x As single =  10 
            Dim y As single =  20 
 
            'Draw title
            Dim title As String =  "Computer Science Subjects:" 
            page.Canvas.DrawString(title, titleFont, brush, x, y)
            y = y + CType(titleFont.MeasureString(title).Height, single)
            y = y + 5
 
            'Specify the marker style
            Dim marker As PdfMarker =  New PdfMarker(PdfUnorderedMarkerStyle.Asterisk) 
            marker.Font = markerFont
 
            'Create an unordered list
            String listContent = "Data Structure\n"
                    + "Algorithm\n"
                    + "Computer Networks\n"
                    + "Operating System\n"
                    + "Theory of Computations\n"
                    + "C Programming\n"
                    +"Computer Organization and Architecture" 
 
            Dim list As PdfList =  New PdfList(listContent) 
 
            'Set the font, indent, text indent, brush, maker of the list
            list.Font = listFont
            list.Indent = 2
            list.TextIndent = 4
            list.Brush = brush
            list.Marker = marker
 
            'Draw list on a page at the specified location
            list.Draw(page, x, y)
 
            'Save to file
            doc.SaveToFile("UnorderedList.pdf")
        End Sub
    End Class
End Namespace

using System;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Lists;

namespace CustomizeBulletPointsWithImage
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Set the margin
            PdfMargins margin = new PdfMargins(30);

            //Add a page
            PdfPageBase page = doc.Pages.Add(PdfPageSize.A4, margin);

            //Create fonts
            PdfFont titleFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Bold);
            PdfFont listFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Regular);

            //Create a brush
            PdfBrush brush = PdfBrushes.Black;

            //Specify the initial coordinate
            float x = 10;
            float y = 20;

            //Draw title
            String title = "Project Task To-Do List:";
            page.Canvas.DrawString(title, titleFont, brush, x, y);
            y = y + (float)titleFont.MeasureString(title).Height;
            y = y + 5;

            //Specify the marker style to image
            PdfMarker marker = new PdfMarker(PdfUnorderedMarkerStyle.CustomImage);

            //Set the image for the marker
            marker.Image = PdfImage.FromFile(@"C:\Users\Administrator\Desktop\checkmark.jpg");

            //Create an unordered list
            String listContent = "Define projects and tasks you're working on\n"
                    + "Assign people to tasks\n"
                    + "Define the priority levels of your tasks\n"
                    + "Keep track of the progress status of your tasks\n"
                    + "Mark tasks as done when completed";
            PdfList list = new PdfList(listContent);

            //Set the font, indent, text indent, brush, maker of the list
            list.Font = listFont;
            list.Indent = 2;
            list.TextIndent = 4;
            list.Brush = brush;
            list.Marker = marker;

            //Draw list on a page at the specified location
            list.Draw(page, x, y);

            //Save to file
            doc.SaveToFile("ImageBullets.pdf");
        }
    }
}

Imports System
Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Lists
 
Namespace CustomizeBulletPointsWithImage
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Set the margin
            Dim margin As PdfMargins =  New PdfMargins(30) 
 
            'Add a page
            Dim page As PdfPageBase =  doc.Pages.Add(PdfPageSize.A4,margin) 
 
            'Create fonts
            Dim titleFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Bold) 
            Dim listFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Regular) 
 
            'Create a brush
            Dim brush As PdfBrush =  PdfBrushes.Black 
 
            'Specify the initial coordinate
            Dim x As single =  10 
            Dim y As single =  20 
 
            'Draw title
            Dim title As String =  "Project Task To-Do List:" 
            page.Canvas.DrawString(title, titleFont, brush, x, y)
            y = y + CType(titleFont.MeasureString(title).Height, single)
            y = y + 5
 
            'Specify the marker style to image
            Dim marker As PdfMarker =  New PdfMarker(PdfUnorderedMarkerStyle.CustomImage) 
 
            'Set the image for the marker
            marker.Image = PdfImage.FromFile("C:\Users\Administrator\Desktop\checkmark.jpg")
 
            'Create an unordered list
            String listContent = "Define projects and tasks you're working on\n"
                    + "Assign people to tasks\n"
                    + "Define the priority levels of your tasks\n"
                    + "Keep track of the progress status of your tasks\n"
                    Dim "Mark tasks as done when completed" As +
            Dim list As PdfList =  New PdfList(listContent) 
 
            'Set the font, indent, text indent, brush, maker of the list
            list.Font = listFont
            list.Indent = 2
            list.TextIndent = 4
            list.Brush = brush
            list.Marker = marker
 
            'Draw list on a page at the specified location
            list.Draw(page, x, y)
 
            'Save to file
            doc.SaveToFile("ImageBullets.pdf")
        End Sub
    End Class
End Namespace

using System;
using Spire.Pdf;
using Spire.Pdf.Graphics;
using Spire.Pdf.Lists;

namespace CreateMultiLevelLists
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Set the margin
            PdfMargins margin = new PdfMargins(30);

            //Add a page
            PdfPageBase page = doc.Pages.Add(PdfPageSize.A4, margin);

            //Specify the initial coordinate
            float x = 10;
            float y = 20;

            //Create two brushes
            PdfBrush blackBrush = PdfBrushes.Black;
            PdfBrush purpleBrush = PdfBrushes.Purple;

            //Create two fonts
            PdfFont titleFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Bold);
            PdfFont listFont = new PdfFont(PdfFontFamily.TimesRoman, 12f, PdfFontStyle.Regular);

            //Create a maker for ordered list
            PdfOrderedMarker marker = new PdfOrderedMarker(PdfNumberStyle.Numeric, listFont);

            //Draw title
            String title = "Below is a Nested Numbered List:";
            page.Canvas.DrawString(title, titleFont, blackBrush, x, y);
            y = y + (float)titleFont.MeasureString(title).Height;
            y = y + 5;

            //Create a parent list
            String parentListContent = "Parent Item 1\n"
                    + "Parent Item 2";
            PdfSortedList parentList = new PdfSortedList(parentListContent);
            parentList.Font = listFont;
            parentList.Indent = 2;
            parentList.Brush = purpleBrush;
            parentList.Marker = marker;

            //Create a sub list - "subList_1"
            String subListContent_1 = "Sub Item 1\n"
                    + "Sub Item 2\n"
                    + "Sub Item 3\n"
                    + "Sub Item 4";
            PdfSortedList subList_1 = new PdfSortedList(subListContent_1);
            subList_1.Indent = 12;
            subList_1.Font = listFont;
            subList_1.Brush = blackBrush;
            subList_1.Marker = marker;
            subList_1.MarkerHierarchy = true;

            //Create another sub list -"subList_2"
            String subListContent_2 = "Sub Item 1\n"
                    + "Sub Item 2\n"
                    + "Sub Item 3";
            PdfSortedList subList_2 = new PdfSortedList(subListContent_2);
            subList_2.Indent = 12;
            subList_2.Font = listFont;
            subList_2.Brush = blackBrush;
            subList_2.Marker = marker;
            subList_2.MarkerHierarchy = true;

            //Create a sub-sub list - "subList_1"
            String subSubListContent_1 = "Sub Sub Item 1\n"
                    + "Sub Sub Item 2";
            PdfSortedList subSubList = new PdfSortedList(subSubListContent_1);
            subSubList.Indent = 20;
            subSubList.Font = listFont;
            subSubList.Brush = blackBrush;
            subSubList.Marker = marker;
            subSubList.MarkerHierarchy = true;

            //Set subList_1 as sub list of the first item of parent list
            PdfListItem item_1 = parentList.Items[0];
            item_1.SubList = subList_1;

            //Set subList_2 as sub list of the second item of parent list
            PdfListItem item_2 = parentList.Items[1];
            item_2.SubList = subList_2;

            //Set subSubList as sub list of the first item of subList_1
            PdfListItem item_1_1 = subList_1.Items[0];
            item_1_1.SubList = subSubList;

            //Draw parent list
            parentList.Draw(page, x, y);

            //Save to file
            doc.SaveToFile("MultiLevelList.pdf");
        }
    }
}

Imports System
Imports Spire.Pdf
Imports Spire.Pdf.Graphics
Imports Spire.Pdf.Lists
 
Namespace CreateMultiLevelLists
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Set the margin
            Dim margin As PdfMargins =  New PdfMargins(30) 
 
            'Add a page
            Dim page As PdfPageBase =  doc.Pages.Add(PdfPageSize.A4,margin) 
 
            'Specify the initial coordinate
            Dim x As single =  10 
            Dim y As single =  20 
 
            'Create two brushes
            Dim blackBrush As PdfBrush =  PdfBrushes.Black 
            Dim purpleBrush As PdfBrush =  PdfBrushes.Purple 
 
            'Create two fonts
            Dim titleFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Bold) 
            Dim listFont As PdfFont =  New PdfFont(PdfFontFamily.TimesRoman,12f,PdfFontStyle.Regular) 
 
            'Create a maker for ordered list
            Dim marker As PdfOrderedMarker =  New PdfOrderedMarker(PdfNumberStyle.Numeric,listFont) 
 
            'Draw title
            Dim title As String =  "Below is a Nested Numbered List:" 
            page.Canvas.DrawString(title, titleFont, blackBrush, x, y)
            y = y + CType(titleFont.MeasureString(title).Height, single)
            y = y + 5
 
            'Create a parent list
            String parentListContent = "Parent Item 1\n"
                    Dim "Parent Item 2" As +
            Dim parentList As PdfSortedList =  New PdfSortedList(parentListContent) 
            parentList.Font = listFont
            parentList.Indent = 2
            parentList.Brush = purpleBrush
            parentList.Marker = marker
 
            'Create a sub list - "subList_1"
            String subListContent_1 = "Sub Item 1\n"
                    + "Sub Item 2\n"
                    + "Sub Item 3\n"
                    Dim "Sub Item 4" As +
            Dim subList_1 As PdfSortedList =  New PdfSortedList(subListContent_1) 
            subList_1.Indent = 12
            subList_1.Font = listFont
            subList_1.Brush = blackBrush
            subList_1.Marker = marker
            subList_1.MarkerHierarchy = True
 
            'Create another sub list -"subList_2"
            String subListContent_2 = "Sub Item 1\n"
                    + "Sub Item 2\n"
                    Dim "Sub Item 3" As +
            Dim subList_2 As PdfSortedList =  New PdfSortedList(subListContent_2) 
            subList_2.Indent = 12
            subList_2.Font = listFont
            subList_2.Brush = blackBrush
            subList_2.Marker = marker
            subList_2.MarkerHierarchy = True
 
            'Create a sub-sub list - "subList_1"
            String subSubListContent_1 = "Sub Sub Item 1\n"
                    Dim "Sub Sub Item 2" As +
            Dim subSubList As PdfSortedList =  New PdfSortedList(subSubListContent_1) 
            subSubList.Indent = 20
            subSubList.Font = listFont
            subSubList.Brush = blackBrush
            subSubList.Marker = marker
            subSubList.MarkerHierarchy = True
 
            'Set subList_1 as sub list of the first item of parent list
            Dim item_1 As PdfListItem =  parentList.Items(0) 
            item_1.SubList = subList_1
 
            'Set subList_2 as sub list of the second item of parent list
            Dim item_2 As PdfListItem =  parentList.Items(1) 
            item_2.SubList = subList_2
 
            'Set subSubList as sub list of the first item of subList_1
            Dim item_1_1 As PdfListItem =  subList_1.Items(0) 
            item_1_1.SubList = subSubList
 
            'Draw parent list
            parentList.Draw(page, x, y)
 
            'Save to file
            doc.SaveToFile("MultiLevelList.pdf")
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.PDF

using Spire.Pdf;

namespace PDFProperties
{
    class Properties
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument instance
            PdfDocument pdf = new PdfDocument();

            //Load a sample PDF document
            pdf.LoadFromFile("input.pdf");

            //Set the title
            pdf.DocumentInformation.Title = "PDF (Portable Document Format)";

            //Set the author
            pdf.DocumentInformation.Author = "E-iceblue";

            //Set the subject
            pdf.DocumentInformation.Subject = "Set PDF Properties";

            //Set the keywords
            pdf.DocumentInformation.Keywords = "NET PDF, Properties, Document";

            //Set the producer name
            pdf.DocumentInformation.Producer = "Spire.PDF";

            //Save the result document
            pdf.SaveToFile("PdfProperties.pdf");
        }
    }
}

Imports Spire.PDF

Namespace PDFProperties
    Class Properties
        Private Shared Sub Main(ByVal args() As String)
            'Create a PdfDocument instance
            Dim pdf As PdfDocument = New PdfDocument

            'Load a sample PDF document
            pdf.LoadFromFile("input.pdf")

            'Set the title
            pdf.DocumentInformation.Title = "PDF (Portable Document Format)"

            'Set the author
            pdf.DocumentInformation.Author = "E-iceblue"

            'Set the subject
            pdf.DocumentInformation.Subject = "Set PDF Properties"

            'Set the keywords
            pdf.DocumentInformation.Keywords = "NET PDF, Properties, Document"

            'Set the producer name
            pdf.DocumentInformation.Producer = "Spire.PDF"

            'Save the result document
            pdf.SaveToFile("PdfProperties.pdf")
        End Sub
    End Class
End Namespace

using Spire.Pdf;
using System.IO;
using System.Text;

namespace GetPdfProperties

{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a PdfDocument instance
            PdfDocument pdf = new PdfDocument();

            //Load a sample PDF document 
            pdf.LoadFromFile("PdfProperties.pdf");

            //Create a StringBuilder instance
            StringBuilder content = new StringBuilder();

            //Get the PDF document properties and append them in the StringBuilder
            content.Append("Title: " + pdf.DocumentInformation.Title + "\r\n");
            content.Append("Author: " + pdf.DocumentInformation.Author + "\r\n");
            content.Append("Subject: " + pdf.DocumentInformation.Subject + "\r\n");
            content.Append("Keywords: " + pdf.DocumentInformation.Keywords + "\r\n");
            content.Append("PDF Producer: " + pdf.DocumentInformation.Producer + "\r\n");

            //Write the StringBuilder to a TXT file
            File.WriteAllText("GetPDFProperties.txt", content.ToString());
        }
    }
} 

Imports Spire.PDF
Imports System.IO
Imports System.Text

Namespace GetPdfProperties
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            'Create a PdfDocument instance
            Dim pdf As PdfDocument = New PdfDocument

            'Load a sample PDF document 
            pdf.LoadFromFile("PdfProperties.pdf")

            'Create a StringBuilder instance
            Dim content As StringBuilder = New StringBuilder

            'Get the PDF document properties and append them in the StringBuilder
            content.Append("Title: " & pdf.DocumentInformation.Title & vbCrLf)
            content.Append("Author: " & pdf.DocumentInformation.Author & vbCrLf)
            content.Append("Subject: " & pdf.DocumentInformation.Subject & vbCrLf)
            content.Append("Keywords: " & pdf.DocumentInformation.Keywords & vbCrLf)
            content.Append("PDF Producer: " & pdf.DocumentInformation.Producer & vbCrLf)

            'Write the StringBuilder to a TXT file
            File.WriteAllText("GetPDFProperties.txt", content.ToString)
        End Sub
    End Class
End Namespace

PM> Install-Package Spire.PDF

using System;
using Spire.Pdf;

namespace SplitPDFIntoIndividualPages
{
    class Program
    {
        static void Main(string[] args)
        {
            //Specify the input file path
            String inputFile = "C:\\Users\\Administrator\\Desktop\\Terms of Service.pdf";

            //Specify the output directory
            String outputDirectory = "C:\\Users\\Administrator\\Desktop\\Output\\";

            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Load a PDF file
            doc.LoadFromFile(inputFile);

            //Split the PDF to one-page PDFs
            doc.Split(outputDirectory + "output-{0}.pdf", 1);
        }
    }
}

Imports System
Imports Spire.Pdf
 
Namespace SplitPDFIntoIndividualPages
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Specify the path of the input file
            Dim inputFile As String =  "C:\\Users\\Administrator\\Desktop\\Terms of Service.pdf" 
 
            'Specify the output directory
            Dim outputDirectory As String =  "C:\\Users\\Administrator\\Desktop\\Output\\" 
 
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Load a PDF file
            doc.LoadFromFile(inputFile)
 
            'Split the PDF to one-page PDFs
            doc.Split(outputDirectory + "output-{0}.pdf", 1)
        End Sub
    End Class
End Namespace

using Spire.Pdf;
using System;

namespace SplitPdfByPageRanges
{
    class Program
    {
        static void Main(string[] args)
        {
            //Specify the input file path
            String inputFile = "C:\\Users\\Administrator\\Desktop\\Terms of Service.pdf";

            //Specify the output directory
            String outputDirectory = "C:\\Users\\Administrator\\Desktop\\Output\\";

            //Load the source PDF file while initialing the PdfDocument object
            PdfDocument sourceDoc = new PdfDocument(inputFile);

            //Create two additional PdfDocument objects
            PdfDocument newDoc_1 = new PdfDocument();
            PdfDocument newDoc_2 = new PdfDocument();

            //Insert the first page of source file to the first document
            newDoc_1.InsertPage(sourceDoc, 0);

            //Insert the rest pages of source file to the second document
            newDoc_2.InsertPageRange(sourceDoc, 1, sourceDoc.Pages.Count - 1);

            //Save the two documents as PDF files
            newDoc_1.SaveToFile(outputDirectory + "output-1.pdf");
            newDoc_2.SaveToFile(outputDirectory + "output-2.pdf");
        }
    }
}

Imports Spire.Pdf
Imports System
 
Namespace SplitPdfByPageRanges
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Specify the input file path
            Dim inputFile As String =  "C:\\Users\\Administrator\\Desktop\\Terms of Service.pdf" 
 
            'Specify the output directory
            Dim outputDirectory As String =  "C:\\Users\\Administrator\\Desktop\\Output\\" 
 
            'Load the source PDF file while initialing the PdfDocument object
            Dim sourceDoc As PdfDocument =  New PdfDocument(inputFile) 
 
            'Create two additional PdfDocument objects
            Dim NewDoc_1 As PdfDocument =  New PdfDocument() 
            Dim NewDoc_2 As PdfDocument =  New PdfDocument() 
 
            'Insert the first page of source file to the first document
            NewDoc_1.InsertPage(sourceDoc, 0)
 
            'Insert the rest pages of source file to the second document
            NewDoc_2.InsertPageRange(sourceDoc, 1, sourceDoc.Pages.Count - 1)
 
            'Save the two documents as PDF files
            NewDoc_1.SaveToFile(outputDirectory + "output-1.pdf")
            NewDoc_2.SaveToFile(outputDirectory + "output-2.pdf")
        End Sub
    End Class
End Namespace