Unknown Error occur when processing every request

Question

Hi to all,
I click every event some unknown error occur every click processing.The following error is
Sys.WebForms.PageRequestManagerServerErrorException.An unknown error occurred while processing the request on server.The status code returned from server 0.
how to solve this error.Why this come this error?please can any one help me.

Sam Hobbs · Answer

First look at your program and ensure that it is checking for errors, including checking for invalid data. Vague errors such as unknown error is often caused by errors being ignored.
If the problem still exists after doing that, then single-step using the debugger. Do you understand how to do that?