In Your ASPX page for the
gridview
you have mapped the event
gvEmployee_RowEditing for
OnRowEditing
The event method is missing in the code behind file (aspx.cs).
Try to add a new event for
gvEmployee_RowEditing
or map to the desired event in the code behind...
To fix this issue,Add this in your code behind.cs
protected void gvEmployee_RowEditing(object sender, GridViewEditEventArgs e)
{
}