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Editorial Team
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Asked: 2026-06-13T04:42:08+00:00

I am following the instructions here: http://msdn.microsoft.com/en-us/library/ms228772(v=vs.80).aspx for .net 3.5 visual studio 2008 to

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I am following the instructions here:

http://msdn.microsoft.com/en-us/library/ms228772(v=vs.80).aspx

for .net 3.5 visual studio 2008 to fix this issue:

call was rejected by callee

for this line of code:

t = System.Type.GetTypeFromProgID("VisualStudio.DTE.8.0",
              true);

I am getting this error:

COMException was unhandled: Invalid class string (Exception from
HRESULT: 0x800401F3 (CO_E_CLASSSTRING))

Does anyone know what this means, and what am I doing wrong?

thank you so much for your guidance.

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1 Answer

  1. Editorial Team

    Your code doesn’t match the tag you used. VS2008 is Visual Studio version 9.0. So the proper progid is VisualStudio.DTE.9.0. The full list of version numbers:

    • VS2002 : 7.0
    • VS2003 : 7.1
    • VS2005 : 8.0
    • VS2008 : 9.0
    • VS2010 : 10.0
    • VS2012 : 11.0
    • VS2013 : 12.0

    You can also use the VisualStudio.DTE progid. You’ll get whatever version of VS was installed last. A bit random.

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