protected void ASPxPivotGrid1_CustomCallback(object sender, DevExpress.Web.ASPxPivotGrid.PivotGridCustomCallbackEventArgs e)
{
int dataFieldIndex = Convert.ToInt32(e.Parameters);
Label1.Text = ASPxPivotGrid1.GetFieldByArea(PivotArea.DataArea, dataFieldIndex).SummaryType.ToString();
}