![A page can have only one server-side Form tag. - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial A page can have only one server-side Form tag. - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial](https://1.bp.blogspot.com/-sCFDWUGQiV4/UfOVf3fKGSI/AAAAAAAAAqw/frfxNH1tyVo/w1200-h630-p-k-no-nu/Serverside.png)
A page can have only one server-side Form tag. - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial
Tip] System.InvalidOperationException: RegisterForEventValidation can only be called during Render();
![A page can have only one server-side Form tag. - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial A page can have only one server-side Form tag. - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial](https://1.bp.blogspot.com/-sCFDWUGQiV4/UfOVf3fKGSI/AAAAAAAAAqw/frfxNH1tyVo/s1600/Serverside.png)
A page can have only one server-side Form tag. - ASPMANTRA | Asp.Net,MVC,AngularJs,Jquery,Javascript,Sql Server AND WCF snippets and tutorial
![GridView Export to Excel: RegisterForEventValidation can only be called during Render | ASPForums.Net GridView Export to Excel: RegisterForEventValidation can only be called during Render | ASPForums.Net](https://www.aspforums.net/Avatars/PRASADBAB.jpg?635249201086600000)