count records in SqlDataSource : asp .net c#

Select the "Selected" event from the event list of SqlDataSource and then,

protected void SqlDataSource1_Selected(object sender, SqlDataSourceStatusEventArgs e)
    {
        if (e.AffectedRows == 0)
        {
            warningLbl.Text = "No Record Found with this Student Number!";
            return;
        }

    }

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