CellValidation event fires twice

[Francois]

I show a message box in cellvalidating event to show the error message as a Messagebox..

It usually work ok, but if i use the TAB key to move out of the field, the event fire twice (so the message box show twice... )


A sample project is attached to the support ticket #384333
http://www.telerik.com/account/support-tickets/view-ticket.aspx?threadid=384333

[Yordanka]

Hello Francois,

Please, find our reply in the other forum thread started by you.

Regards,
Yordanka
the Telerik team

[Scott Michetti]

I'm having the same issue. So can you show the solution? I couldn't find the other thread you refer to.

Thanks
Scott

[Yordanka]

Hello Scott,

The problem comes from the fact that MessageBox gets the focus after TAB key is pressed. So, CommitEdit() is called and respectively CellValidating() is fired again. To avoid this, you have two options - either to set ActionOnLostFocus to None or to show validation message in this way:

private void ctlTelerik_CellValidating(object sender, Telerik.Windows.Controls.GridViewCellValidatingEventArgs e)
        {
            if (e.NewValue.ToString().Length > 4)
            {
                e.IsValid = false;
                //MessageBox.Show("Username too long");
                e.ErrorMessage = "Username too long";
            }
        }

 

Regards,
Yordanka
the Telerik team