void BDataBinding(object sender, EventArgs e)
{
var b = (LinkButton)sender;
var row = (GridViewRow)b.NamingContainer;
DataBinding.Invoke(sender, new TestButtonEventArgs { Item = row.DataItem });
b.Text = DataBinder.Eval(row.DataItem, _datafield).ToString();
b.ToolTip = ToolTip ?? b.ToolTip;
}