Hi Buddy,
I'm facing a very serious issue like application is throwing an error "Operation is not valid due to current state of an object" when have a post back. My page has a grid view with text box inside without paging because it's a delivery page, I was googling and understood this error can over come by adding
<appSettings><addkey="aspnet:MaxHttpCollectionKeys"value="2001"/></appSettings> in web.config file, I added the same with more value, but system is still throwing the same error.
Anyoine have any idea how we can fix this issue? Please advice me friends.