private void ClearDataSet ( DataSet myDataSet ) {
   // to test, print the number rows in each table.

   foreach ( DataTable tbl in myDataSet.Tables ) {
      Response.Write ( tbl.TableName + "Rows.Count = " +
         tbl.Rows.Count.ToString ( ) );
  }

   // clear all rows of each table.
   myDataSet.Clear ( );

   // print the number of rows again.
   foreach ( DataTable tbl in myDataSet.Tables ) {
      Response.Write ( tbl.TableName +  "Rows.Count = "  +
         tbl.Rows.Count.ToString ( ) );
   }
}

Private Sub ClearDataSet ( ByVal myDataSet As DataSet )
   ' to test, print the number rows in each table.
   Dim tbl As DataTable
   For Each tbl In myDataSet.Tables
      Response.Write ( tbl.TableName & "Rows.Count = " & _
         tbl.Rows.Count.ToString ( ) )
   Next

   ' clear all rows of each table.
   myDataSet.Clear ( )

   ' print the number of rows again.
   For Each tbl In myDataSet.Tables
      Response.Write ( tbl.TableName & "Rows.Count = " & _
         tbl.Rows.Count.ToString ( ) )
   Next
End Sub