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calling .net assembly DLL methods

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I have a .net assembly DLL that throws an error when one of the methods are called.  To retrieve info from the device under test, a request for the property must be issued which returns a 'requestID'.  The 'getResponse' method is then called which is suppose to return the value of the property.  When the VI runs it throws a 'System.NullReferenceException' error.  The VI and the .h files are attached.  Thank you so much

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Accepted by topic author 4play

Issue resolved.  There was an error in the DLL.

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