Invalid postback or callback argument. Event validation is enabled using ''

Question

I am getting the following error when I post back a page from the client-side. I have JavaScript code that modifies an asp:ListBox on the client side.

How do we fix

Answer 1

(1) EnableEventValidation="false"...................It does not work for me.

(2) ClientScript.RegisterForEventValidation....It does not work for me.

Solution 1:

Change Button/ImageButton to LinkButton in GridView. It works. (But I like ImageButton)

Research: Button/ImageButton and LinkButton use different methods to postback

Original article:

http://geekswithblogs.net/mahesh/archive/2006/06/27/83264.aspx

Solution 2:

In OnInit() , enter the code something like this to set unique ID for Button/ImageButton :

protected override void OnInit(EventArgs e) {
  foreach (GridViewRow grdRw in gvEvent.Rows) {

  Button deleteButton = (Button)grdRw.Cells[2].Controls[1];

  deleteButton.ID = "btnDelete_" + grdRw.RowIndex.ToString();           
  }
}

Original Article:

http://www.c-sharpcorner.com/Forums/Thread/35301/