Hi, I hv following eror in my webapplication, plz help me to solve.

Hi,
 
Do little search on Google/Yahoo/Bing. There are many many entries in this and other forums with various fixes.
 
One CP Link:
Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot...[^]
 
One MSDN:
 
http://social.msdn.microsoft.com/Forums/pl-PL/vstswebtest/thread/cd9c5c03-4bf3-472b-814a-cd498b190c57[^]
 
And one more:
 

http://stackoverflow.com/questions/8181590/validation-of-viewstate-mac-failed-server-error-in-application[^]
 
Thanks
MT