Object reference not set to an instance of an object. Please review the stack trace for more information about the error and where it originated in the code. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Page_Load(Object sender, EventArgs e) +829 System. EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15 System. Callback(Object sender, EventArgs e) +33 System. read more