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I want to use IApplication interface in my program . but when i run my code, an exception occured in visual studio . i create an object from IApplication (IApplication paap) but i can't use it. help please . enter image description here

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How have you initialized the paap variable? This seems like a class library. Are you getting it as a hook on the onCreate Event? – Devdatta Tengshe Dec 9 '12 at 5:58

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