ComponentOne Excel for .NET
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    Creating Subtotals
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    The following code provides an example of how to format the cells of a book.

    1. Double-click the C1XLBook component in the Toolbox to add it to your form.
    2. Select View | Code and add one of the following statements at the top of the form:
      • Import C1.C1Excel (Visual Basic)
      • using C1.C1Excel; (C#)
    3. Add the following code to the Form_Load event:

      To write code in Visual Basic

      Visual Basic
      Copy Code 
      Private Sub Form1_Load(sender As Object, e As EventArgs)
   Dim book As New C1XLBook()
   Dim sheet As XLSheet = book.Sheets(0)
   Dim totalStyle As New XLStyle(book)
   totalStyle.Font = New Font(book.DefaultFont, FontStyle.Bold)
   sheet(2, 1).Value = "Number"
   sheet(2, 2).Value = "ID"
   sheet(3, 1).Value = 12
   sheet(3, 2).Value = 17
   sheet.Rows(3).OutlineLevel = 2
   sheet.Rows(3).Visible = False
   sheet(4, 1).Value = 12
   sheet(4, 2).Value = 14
   sheet.Rows(4).OutlineLevel = 2
   sheet.Rows(4).Visible = False
   sheet(5, 1).Value = "12 Total"
   sheet(5, 1).Style = totalStyle
   sheet(5, 2).Value = 31
   sheet(5, 2).Formula = "SUBTOTAL(9,C4:C5)"
   sheet.Rows(5).OutlineLevel = 1
   sheet(6, 1).Value = 34
   sheet(6, 2).Value = 109
   sheet.Rows(6).OutlineLevel = 2
   sheet(7, 1).Value = "34 Total"
   sheet(7, 1).Style = totalStyle
   sheet(7, 2).Value = 109
   sheet(7, 2).Formula = "SUBTOTAL(9,C7:C7)"
   sheet.Rows(7).OutlineLevel = 1
   sheet(8, 1).Value = "Grand Total"
   sheet(8, 1).Style = totalStyle
   sheet(8, 2).Value = 140
   sheet(8, 2).Formula = "SUBTOTAL(9,C4:C7)"
   sheet.Rows(8).OutlineLevel = 0
   book.Save("c:\mybook.xls")
   System.Diagnostics.Process.Start("C:\mybook.xls")
End Sub

      To write code in C#

      C#
      Copy Code 
      private void Form1_Load(object sender, EventArgs e)
        {
            C1XLBook book = new C1XLBook();
            XLSheet sheet = book.Sheets[0];
            XLStyle totalStyle = new XLStyle(book);
            totalStyle.Font = new Font(book.DefaultFont, FontStyle.Bold);
            sheet[2, 1].Value = "Number";
            sheet[2, 2].Value = "ID";
            sheet[3, 1].Value = 12;
            sheet[3, 2].Value = 17;
            sheet.Rows[3].OutlineLevel = 2;
            sheet.Rows[3].Visible = false;
            sheet[4, 1].Value = 12;
            sheet[4, 2].Value = 14;
            sheet.Rows[4].OutlineLevel = 2;
            sheet.Rows[4].Visible = false;
            sheet[5, 1].Value = "12 Total";
            sheet[5, 1].Style = totalStyle;
            sheet[5, 2].Value = 31;
            sheet[5, 2].Formula = "SUBTOTAL(9,C4:C5)";
            sheet.Rows[5].OutlineLevel = 1;
            sheet[6, 1].Value = 34;
            sheet[6, 2].Value = 109;
            sheet.Rows[6].OutlineLevel = 2;
            sheet[7, 1].Value = "34 Total";
            sheet[7, 1].Style = totalStyle;
            sheet[7, 2].Value = 109;
            sheet[7, 2].Formula = "SUBTOTAL(9,C7:C7)";
            sheet.Rows[7].OutlineLevel = 1;
            sheet[8, 1].Value = "Grand Total";
            sheet[8, 1].Style = totalStyle;
            sheet[8, 2].Value = 140;
            sheet[8, 2].Formula = "SUBTOTAL(9,C4:C7)";
            sheet.Rows[8].OutlineLevel = 0;
            book.Save(@"c:\mybook.xls");
            System.Diagnostics.Process.Start(@"C:\mybook.xls");
        }
    4. Run the program. The spreadsheet will open and look similar to the following:
              

      The SUBTOTAL formulas get the sum of the specified rows.