private DataTable TableSort(DataTable dt, string sort)
{
     DataRow[] resultRows = dt.Select( null , sort);
     DataTable tableTemp = dt.Copy();
     tableTemp.Rows.Clear();
     foreach (DataRow dr in resultRows)
     {
         object [] objItem = dr.ItemArray;
         DataRow row = tableTemp.NewRow();
         row.ItemArray = objItem;
         tableTemp.Rows.Add(row);
     }
     return tableTemp;
}

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