When view 10 to 20 pages pdf file in rad pdfviewer , we getting blank page in thumbnail

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PdfViewer and PdfViewerNavigator
M Kumar
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M Kumar asked on 11 Mar 2022, 05:32 AM | edited on 11 Mar 2022, 06:56 AM
  We are try to use Rad Pdf viewer which load pdf file with 10 to 20 pages, in that some of thumbnail showing blank page and when click that blank page thumbnail we getting error like "Object reference not set to an instance of an object", If close and open it show blank page for different pages.
Our code is :

        Me.RadPdfViewer1.LoadDocument(System.Windows.Forms.Application.StartupPath + "\pdf\Sample.pdf")

Here we attach error screenshot and exe and testing file at your end, We cant send whole project bcz size more that 30 mb, so we send exe and testing file, In form load event just used above one line code.

Pls reply asap


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Dess | Tech Support Engineer, Principal
Telerik team
answered on 11 Mar 2022, 05:47 AM

Hi, Kumar,

I have noticed that the referred assemblies are pointing to an old version:

I have tested loading the provided document with the latest version of the Telerik UI for WinForms suite and it seems to load properly: