public void ClearContent(
    PdfRectangle rect,
    PdfClearContentOptions options
)

Public Sub ClearContent(
    rect As PdfRectangle,
    options As PdfClearContentOptions
)

using (PdfDocumentProcessor pdfDocumentProcessor = new PdfDocumentProcessor())
{
    // Load a document
    pdfDocumentProcessor.LoadDocument("Document.pdf");

    // Access the first page properties
    PdfPageFacade pageFacade = pdfDocumentProcessor.DocumentFacade.Pages[0];

    // Define an area to clear
    PdfRectangle cropBox = pdfDocumentProcessor.Document.Pages[0].CropBox;
    double halfPage = cropBox.Top / 2;
    PdfRectangle pageRectangle = new PdfRectangle(cropBox.Left, halfPage, cropBox.Right + halfPage, cropBox.Top);

    // Set what content type to keep
    PdfClearContentOptions options = new PdfClearContentOptions()
    {
      ClearAnnotations = false,
      ClearGraphics = false, 
      ClearImages = false
    };

    // Clear the page area
    pageFacade.ClearContent(pageRectangle, options);

    pdfDocumentProcessor.SaveDocument("Document_cleared.pdf");
}

Using pdfDocumentProcessor As New PdfDocumentProcessor()

  ' Load a document
  pdfDocumentProcessor.LoadDocument("Document.pdf")

  ' Access the first page properties
  Dim pageFacade As PdfPageFacade = pdfDocumentProcessor.DocumentFacade.Pages(0)

  ' Define an area to clear
  Dim cropBox As PdfRectangle = pdfDocumentProcessor.Document.Pages(0).CropBox
  Dim halfPage As Double = cropBox.Top / 2
  Dim pageRectangle As New PdfRectangle(cropBox.Left, halfPage, cropBox.Right + halfPage, cropBox.Top)

  ' Set what content type to keep
  Dim options As New PdfClearContentOptions() With
   {
      .ClearAnnotations = False,
      .ClearGraphics = False,
      .ClearImages = False
  }

  ' Clear the page area
  pageFacade.ClearContent(pageRectangle, options)

  pdfDocumentProcessor.SaveDocument("Document_cleared.pdf")
End Using