C# DataTable 行转列

public System.Data.DataTable RowToCol(System.Data.DataTable dataSource)
 {
         var tblPivot = new System.Data.DataTable();
         var firstColumnName = dataSource.Columns[0].ColumnName;
         tblPivot.Columns.Add(firstColumnName);
         for (int i = 1; i < dataSource.Rows.Count; i++)
         {
             tblPivot.Columns.Add(Convert.ToString(i));
         }
         for (int col = 0; col < dataSource.Columns.Count; col++)
         {
             var r = tblPivot.NewRow();
             r[0] = dataSource.Columns[col].ToString();
             for (int j = 1; j < dataSource.Rows.Count; j++)
                 r[j] = dataSource.Rows[j][col];

             tblPivot.Rows.Add(r);
         }
         tblPivot.Columns.Remove(firstColumnName);
         return tblPivot;
  }