KB 831150 - View-state is invalid for this page" error message does not provide sufficient information to troubleshoot the issue
Most asp.net developers have one time or the other ran into messing up their view-state causing asp.net to throw the "View-state is invalid for this page" exception. After scratching their heads for a while and figuring out what is screwing their view-state they'll probably fix it in the end. But wouldn't it be much nicer if the exception contained some info about what actually wrong ? Lo and behold they newly released KB : Microsoft Knowledge Base Article - 831150 , INFO: "View state is invalid for this page" error message does not provide sufficient information to troubleshoot the issue. Unfortunately you have to contact Microsoft to get the hot-fix, but it probably will be included in the next service pack