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I have developed an C# WinForms application with the setup project in Visual Studio 2010 and am using SqlClient, .NET Entity Framework 4 and Crystal Reports 2011 as well.

I installed my WinForms application on other computer for testing purposes, the installation was successful. I have installed .NET EF 4 on the testing computer as well and when I run the installed application and when I click on login it give unhandled exception... error:

this Error

I really could not figure out the actual problem and am stuck. Any help will be highly appreciated.

haraman
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Tshencho Tshering
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  • put the try catch block on your login click event and handle exception and see what exactly cause the problem – Dhaval Patel Nov 18 '15 at 10:51
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    Possible duplicate of [What is a NullReferenceException and how do I fix it?](http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) – Equalsk Nov 18 '15 at 10:52

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