Login system for my C# application

Login system for my C# application

References

Reference NO 1

http://social.msdn.microsoft.com/Forums/vstudio/en-US/36e1bcfa-a46a-47a8-8b21-78357efe866b/action?threadDisplayName=how-to-get-windows-login-credentials-using-cnet

Reference NO 2

http://stackoverflow.com/questions/17859007/c-sharp-cafe-manager-application-that-requires-login-and-runs-at-startup

Reference NO 3

http://www.sourcecodester.com/c/login-object-oriented-programming-c.html

Reference NO 4

http://forums.asp.net/t/1278022.aspx/1

Reference NO 5

http://www.dreamincode.net/forums/topic/98022-c%23-login-system/

Reference NO 6

http://codereview.stackexchange.com/questions/186/getting-setting-default-values-from-my-app-config

Reference NO 7

http://www.codeproject.com/Questions/515076/Createplusepluslogin-2flogoutplussystemplusforplus

Reference NO 8

http://serverfault.com/questions/381804/c-sql-server-login-failed-when-connecting-from-remote-machine