Comments by Arrinters1975 (Top 2 by date)

Arrinters1975 20-Aug-15 4:16am View

Does this happen on: this.Page.RenderControl(hw);
If it does then try adding the following in your code behind:

public override void VerifyRenderingInServerForm(Control control) { }

If the problem remains then additionally add the following in your page's source:

<%@ Page ... EnableEventValidation="false" %>

If the issue does not lie in RenderControl method then try another approach, for example try this C# conversion of HTML web page to a PDF file.

Arrinters1975 19-Aug-15 3:40am View

Unfortunately there is no build in class(es) in .NET that can enable you to do this, you'll need to use some external library. For example you can take a look at this .NET library for manipulating with Word files. Beside the Word files it can manipulate with quite a few other document formats, also here is a demonstration sample for converting a HTML page into a PDF by using C#.