ppt.SaveToSvgOption.ConvertPictureUsingGraphicTag = true;

Presentation.SetCustomFontsDirctory("myfonts");

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
StringBuilder stringBuilder= new StringBuilder();
IChart chart = ppt.Slides[0].Shapes[0] as IChart;
if (chart != null)
{
	int lastRow = chart.ChartData.LastRowIndex;
	int lastCol = chart.ChartData.LastColIndex;
	sb.AppendLine("lastRow" + lastRow + "\r
" + "lastColumn" + lastCol);
	int dataRow = chart.Series[2].Values[chart.Series[2].Values.Count - 1].Row; 
	int dataColumn = chart.Series[2].Values[chart.Series[2].Values.Count - 1].Column; 
	sb.AppendLine("dataRow" + datarow + "\r
" + "dataColumn" + dataColumn);
	chart.ChartData.Clear(dataRow + 1, 0, lastRow + 1, lastCol + 1);  
	chart.ChartData.Clear(0, dataColumn + 1, lastRow + 1, lastCol + 1); 
}
File.WriteAllText(outputFile_T,stringBuilder.ToString());
ppt.SaveToFile(outputFile, FileFormat.Pptx2013);
ppt.Dispose();

Presentation ppt = new Presentation();
ppt.LoadFromFile("1.pptx");
ppt.SaveToFile("1.md", FileFormat.Markdown);
ppt.Dispose();

//The unit is point
shape.TextFrame.ColumnSpacing = 20.50f;

public enum InsertPlaceholderType
{
   Content = 0,
   VerticalContent = 1,
   Text = 2,
   VerticalText = 3,
   Picture = 4,
   Chart = 5,
   Table = 6,
   SmartArt = 7,
   Media = 8,
   OnlineImage = 9
}

presentation.Masters[0].Layouts[0].InsertPlaceholder(InsertPlaceholderType.Text, new RectangleF(20, 30, 400, 400));

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
IChart chart = ppt.Slides[0].Shapes[9] as IChart;
ProjectionType type = chart.Series[0].ProjectionType;
chart.Series[0].ProjectionType = ProjectionType.Robinson;
ppt.SaveToFile(outputFile, FileFormat.Pptx2013);
ppt.Dispose();

Presentation ppt = new Presentation();
string latexMathCode = "x^{2}+\\sqrt{x^{2}+1=2}";
IAutoShape shape = ppt.Slides[0].Shapes.AppendShape(ShapeType.Rectangle, new RectangleF(30, 100, 400, 200));
shape.TextFrame.Paragraphs.Clear();
TextParagraph p = new TextParagraph();
p.ParagraphProperties.DefaultTextRangeProperties.Fill.FillType = FillFormatType.Solid;
p.ParagraphProperties.DefaultTextRangeProperties.Fill.SolidColor.Color = Color.Black;
shape.TextFrame.Paragraphs.Append(p);
TextRange portionEx = new TextRange("Hello World");
p.TextRanges.Append(portionEx);
p.AppendFromLatexMathCode(latexMathCode);
TextRange portionEx2 = new TextRange("My name is Tom.");
p.TextRanges.Append(portionEx2);
ppt.SaveToFile(outputFile, FileFormat.Auto);
ppt.Dispose();

presentation.Slides[0].Shapes.AddFromSVG(inputFile, new RectangleF(40, 40, 200, 200));

Presentation presentation = new Presentation();
presentation.LoadFromFile(inputFile);
IAutoShape shape = presentation.Slides[0].Shapes[0] as IAutoShape;
DefaultTextRangeProperties format = shape.TextFrame.Paragraphs[0].TextRanges[0].DisPlayFormat;
File.AppendAllText(outputFile, "text ：" + shape.TextFrame.Paragraphs[0].TextRanges[0].Text + "\r
");
File.AppendAllText(outputFile, "is bold ：" + format.IsBold + "\r
");
File.AppendAllText(outputFile, "is italic ：" + format.IsItalic + "\r
");

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
ppt.SaveToSvgOption.SaveUnderlineAsDecoration = true;
byte[] svgByte = ppt.Slides[0].Shapes[0].SaveAsSvgInSlide();
FileStream fs = new FileStream(outputFile + "1.svg", FileMode.Create);
fs.Write(svgByte, 0, svgByte.Length);
fs.Close();

Presentation presentation = new Presentation();
presentation.LoadFromFile(@"in.pptx");
bool showMasterShape = presentation.Slides[1].Layout.ShowMasterShapes;

ppt.AddEmbeddedFont(string fontpath);

OleObjectCollection oles = ppt.Slides[0].OleObjects;
OleObject ole= oles[0];
bool result=ole.IsHidden;

presentation.SaveToPdfOption.PdfConformanceLevel = Spire.Presentation.External.Pdf.PdfConformanceLevel.Pdf_A1A;