Hi Deepak Shakya,
We created a demo project and tried to load file from ClientBin/Documents folder. The code we have used to do this is the following:
this.viewer.DocumentSource = new PdfDocumentSource(new Uri("/ClientBin/Documents/Sample.pdf", UriKind.Relative));
It works fine. Please, note that you should make sure your web project has access to the files in the ClientBin folder.
All the best,
the Telerik team
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