Control 'gvdetails' of type 'GridView' must be placed inside a form tag with runat=server

Control 'gvdetails' of type 'GridView' must be placed inside a form tag with runat=server

For the above type of Error Write the following Method in the code behind file.

        
        public override void VerifyRenderingInServerForm(Control control)

        {

            // verifies the control is rendered here

        }