RegisterForEventValidation can only be called during Render();

I was getting this error, while converting gridview data to Excel and word format.

RegisterForEventValidation can only be called during Render();

Then I made EnableEventValidation=”false” in page directive.Then it starts to work

Money December 7, 2011 / 6:30 pm

Does not work in case. I added this in the Page directive of the main page. I have a user control that has the gridview and a button that exports it to excel. i cannot add it to the User control as it does not have this property. So i added it to the main page directive. But does not do anything. Any suggestions?

Reply
- Chandra Dev December 8, 2011 / 4:06 am
  
  Hi,
  
  Please give me some time. I donot have checked on that case.
  
  Reply
- Yossi Bressler July 25, 2012 / 1:34 pm
  
  Money, I also had this issue in UserControl (that does not have EnableEventValidation property).
  
  Removing “asp:HiddenField” from the UserControl, solved the problem.
  I don’t know why, but it just worked for me.
  
  Reply