Hi Every One..
Im using Master Page in my project in my child page im using update panel while hitting the server button im getting this following error and I also added ValidateRequest="false" , EnableEventValidation="false" in webconfig Pages Tag but im still getting the following error.
Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500
Regards
Kanna.