Error : typeInitializationException

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C#

AutoCAD

Hi all,

I've found a code to open a dwg file in autocad with objectARX commands.this code works successfully when i wrote it in a Class Library project, but the problem is happened when i want to place this code in my windows application.It gives me this error message :

The type initializer for '< Module >' threw an exception.

Inner Exception : The C++ module failed to load during process initialization.

My code is :

String MyDWGFilePath = @"\\Server\SharedFolder\Projects\File1.dwg";
DocumentCollection dm = Application.DocumentManager;
Document doc = null;

if(File.Exists(MyDWGFilePath))
{
   doc = dm.Open(MyDWGFilePath, false);
   Application.DocumentManager.MdiActiveDocument = doc;
}

what is my mistake???