PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Conversion.Compression;
    
    namespace CompressPdf
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Load a PDF document while initializing the PdfCompressor object
                PdfCompressor compressor = new PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf");
    
                //Get text compression options
                TextCompressionOptions textCompression = compressor.Options.TextCompressionOptions;
    
                //Compress fonts
                textCompression.CompressFonts = true;
    
                //Unembed fonts
                //textCompression.UnembedFonts = true;
    
                //Get image compression options
                ImageCompressionOptions imageCompression = compressor.Options.ImageCompressionOptions;
    
                //Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High;
    
                //Resize images
                imageCompression.ResizeImages = true;
    
                //Compress images
                imageCompression.CompressImage = true;
    
                //Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf");
            }
        }
    }
    

Imports Spire.Pdf
    Imports Spire.Pdf.Conversion.Compression
    
    Namespace CompressPdf
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Load a PDF document while initializing the PdfCompressor object
                Dim compressor As PdfCompressor =  New PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf")
    
                'Get text compression options
                Dim textCompression As TextCompressionOptions =  compressor.Options.TextCompressionOptions
    
                'Compress fonts
                textCompression.CompressFonts = True
    
                'Unembed fonts
                textCompression.UnembedFonts = True
    
                'Get image compression options
                Dim imageCompression As ImageCompressionOptions =  compressor.Options.ImageCompressionOptions
    
                'Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High
    
                'Resize images
                imageCompression.ResizeImages = True
    
                'Compress images
                imageCompression.CompressImage = True
    
                'Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf")
            End Sub
        End Class
    End Namespace
    

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Conversion.Compression;
    
    namespace CompressPdf
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Load a PDF document while initializing the PdfCompressor object
                PdfCompressor compressor = new PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf");
    
                //Get text compression options
                TextCompressionOptions textCompression = compressor.Options.TextCompressionOptions;
    
                //Compress fonts
                textCompression.CompressFonts = true;
    
                //Unembed fonts
                //textCompression.UnembedFonts = true;
    
                //Get image compression options
                ImageCompressionOptions imageCompression = compressor.Options.ImageCompressionOptions;
    
                //Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High;
    
                //Resize images
                imageCompression.ResizeImages = true;
    
                //Compress images
                imageCompression.CompressImage = true;
    
                //Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf");
            }
        }
    }
    

Imports Spire.Pdf
    Imports Spire.Pdf.Conversion.Compression
    
    Namespace CompressPdf
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Load a PDF document while initializing the PdfCompressor object
                Dim compressor As PdfCompressor =  New PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf")
    
                'Get text compression options
                Dim textCompression As TextCompressionOptions =  compressor.Options.TextCompressionOptions
    
                'Compress fonts
                textCompression.CompressFonts = True
    
                'Unembed fonts
                textCompression.UnembedFonts = True
    
                'Get image compression options
                Dim imageCompression As ImageCompressionOptions =  compressor.Options.ImageCompressionOptions
    
                'Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High
    
                'Resize images
                imageCompression.ResizeImages = True
    
                'Compress images
                imageCompression.CompressImage = True
    
                'Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf")
            End Sub
        End Class
    End Namespace
    

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Conversion.Compression;
    
    namespace CompressPdf
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Load a PDF document while initializing the PdfCompressor object
                PdfCompressor compressor = new PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf");
    
                //Get text compression options
                TextCompressionOptions textCompression = compressor.Options.TextCompressionOptions;
    
                //Compress fonts
                textCompression.CompressFonts = true;
    
                //Unembed fonts
                //textCompression.UnembedFonts = true;
    
                //Get image compression options
                ImageCompressionOptions imageCompression = compressor.Options.ImageCompressionOptions;
    
                //Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High;
    
                //Resize images
                imageCompression.ResizeImages = true;
    
                //Compress images
                imageCompression.CompressImage = true;
    
                //Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf");
            }
        }
    }
    

Imports Spire.Pdf
    Imports Spire.Pdf.Conversion.Compression
    
    Namespace CompressPdf
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Load a PDF document while initializing the PdfCompressor object
                Dim compressor As PdfCompressor =  New PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf")
    
                'Get text compression options
                Dim textCompression As TextCompressionOptions =  compressor.Options.TextCompressionOptions
    
                'Compress fonts
                textCompression.CompressFonts = True
    
                'Unembed fonts
                textCompression.UnembedFonts = True
    
                'Get image compression options
                Dim imageCompression As ImageCompressionOptions =  compressor.Options.ImageCompressionOptions
    
                'Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High
    
                'Resize images
                imageCompression.ResizeImages = True
    
                'Compress images
                imageCompression.CompressImage = True
    
                'Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf")
            End Sub
        End Class
    End Namespace
    

PM> Install-Package Spire.PDF

using Spire.Pdf;
    using Spire.Pdf.Conversion.Compression;
    
    namespace CompressPdf
    {
        class Program
        {
            static void Main(string[] args)
            {
                //Load a PDF document while initializing the PdfCompressor object
                PdfCompressor compressor = new PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf");
    
                //Get text compression options
                TextCompressionOptions textCompression = compressor.Options.TextCompressionOptions;
    
                //Compress fonts
                textCompression.CompressFonts = true;
    
                //Unembed fonts
                //textCompression.UnembedFonts = true;
    
                //Get image compression options
                ImageCompressionOptions imageCompression = compressor.Options.ImageCompressionOptions;
    
                //Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High;
    
                //Resize images
                imageCompression.ResizeImages = true;
    
                //Compress images
                imageCompression.CompressImage = true;
    
                //Save the compressed document to file
                compressor.CompressToFile("Compressed.pdf");
            }
        }
    }
    

Imports Spire.Pdf
    Imports Spire.Pdf.Conversion.Compression
    
    Namespace CompressPdf
        Class Program
            Shared  Sub Main(ByVal args() As String)
                'Load a PDF document while initializing the PdfCompressor object
                Dim compressor As PdfCompressor =  New PdfCompressor("C:\\Users\\Administrator\\Desktop\\ToCompress.pdf")
    
                'Get text compression options
                Dim textCompression As TextCompressionOptions =  compressor.Options.TextCompressionOptions
    
                'Compress fonts
                textCompression.CompressFonts = True
    
                'Unembed fonts
                textCompression.UnembedFonts = True
    
                'Get image compression options
                Dim imageCompression As ImageCompressionOptions =  compressor.Options.ImageCompressionOptions
    
                'Set the compressed image quality
                imageCompression.ImageQuality = ImageQuality.High
    
                'Resize images
                imageCompression.ResizeImages = True
    
                'Compress images
                imageCompression.CompressImage = True
    
                'Save the compressed document to file
                compressor.CompressToFile("Compressed.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>Установка-Пакет 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;
    
    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;
    
    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;
    
    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;
    
    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