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endoExpert 0 Newbie Poster

I have this code in a C# application that is automating a Web app. I want to execute the javascript function and would like to SEE the results, however when running the app I get an exception "Specified cast is not valid." on line 2 below.

mshtml.IHTMLDocument2 doc2 = (mshtml.IHTMLDocument2)ie.Document;
mshtml.IHTMLWindow2 parentWin = doc2.parentWindow;
parentWin.execScript("modifyQueryString(2)", "javascript");

I have seen a dozen very old (2005) versions of solutions to this, and this is one I have tried. I am useing Visual Studion 2008, with SHDocVW.dll and mshtml.dll attached as resources.

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