Tip] System.InvalidOperationException: RegisterForEventValidation can only be called during Render();
![RegisterForEventValidation can only be called during Render(); - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview RegisterForEventValidation can only be called during Render(); - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview](https://3.bp.blogspot.com/-O-2DZQ9biLY/TZQYNOZH7VI/AAAAAAAAAb0/K5AWvQBy90I/w1200-h630-p-k-no-nu/Registerforeventvalidation.jpg)
RegisterForEventValidation can only be called during Render(); - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview
Learn the AJAX Toolskit solution: RegisterDataItem can only be called during an async postback. - Programmer Sought
![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
![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)
GridView Export to Excel: RegisterForEventValidation can only be called during Render | ASPForums.Net
![RegisterForEventValidation can only be called during Render(); - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview RegisterForEventValidation can only be called during Render(); - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview](http://3.bp.blogspot.com/-O-2DZQ9biLY/TZQYNOZH7VI/AAAAAAAAAb0/K5AWvQBy90I/s1600/Registerforeventvalidation.jpg)
RegisterForEventValidation can only be called during Render(); - ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview
![Error when using iTextSharp: RegisterForEventValidation can only be called during Render(); | Solutions, Projects Error when using iTextSharp: RegisterForEventValidation can only be called during Render(); | Solutions, Projects](https://i.pinimg.com/originals/a3/9a/87/a39a870cd0d2728c4ef7b7f41caaeafc.jpg)