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, 30));
shape.TextFrame.Paragraphs.Clear();

//Add math equation
TextParagraph tp = shape.TextFrame.Paragraphs.AddParagraphFromLatexMathCode(latexMathCode);

for (int i = 0; i < ppt.Slides[0].Shapes.Count; i++)
{

    if (ppt.Slides[0].Shapes[i] is IAutoShape)
    {
        //Check whether shape contains math equations
        bool containMathEquation = (ppt.Slides[0].Shapes[i] as IAutoShape).ContainMathEquation;
    }
}
ppt.SaveToFile("result.pptx", FileFormat.Pptx2013);
ppt.Dispose();

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
foreach(Shape shape in ppt.Slides[0].Shapes)
{
    if(shape is IAudio)
    {
        IAudio audio = shape as IAudio;
        audio.HideAtShowing = true;
    }
}

Presentation ppt = new Presentation();
ppt.LoadFromFile(inputFile);
ppt.SaveToFile(ofdFile, FileFormat.OFD);

Presentation ppt = new Presentation();
ppt.IsPasswordProtected(inputFile)

input type=button id=PdfDocumentViewer1_btnRotate onfocus=this.blur() onclick=pdfdocumentviewer1.Rotate(pdfdocumentviewer1.RotateAngle + 270); value=rotate_270 

input type=text id=PdfDocumentViewer1_txtFindText onkeydown=if(event.keyCode==13){pdfdocumentviewer1.SearchText(this.value,true);return false;} value= 

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                this.PdfDocumentViewer1.FindTextHighLightColor =     System.Drawing.Color.FromArgb(125, 255, 0, 0);
                this.PdfDocumentViewer1.LoadFromFile(input.pdf);
            }
        }

Workbook workbook = new Workbook();
workbook.LoadFromFile(xlsxFile);
workbook.SaveToFile(uosFile, FileFormat.UOS);

Workbook workbook = new Workbook();
workbook.LoadFromFile(xlsxFile);
workbook.SaveToFile(ofdFile, FileFormat.OFD);

pivottable.ShowDataFieldInRow = true;
pivottable.CalculateData();

List images = sheet.SaveShapesToImage(new SaveShapeTypeOption());
for (int i = 0; i < images.Count; i++)
{
    images[i].Save(string.Format(outputFile + "{0}.png", i), ImageFormat.Png);
}