Public Function Cells( _
   ByVal start As DDCell, _
   ByVal end As DDCell _
) As DDCells

public DDCells Cells( 
   DDCell start,
   DDCell end
)

private void Form1_Load(object sender, System.EventArgs e)
{
    // Add a sheet to the Sheets collection of the Workbook.
    GrapeCity.SpreadBuilder.Workbook sb = new GrapeCity.SpreadBuilder.Workbook();
    sb.Sheets.AddNew();
    // Set the properties, values, for columns, rows, and cells.
    sb.Sheets[0].Name = "Customer Call List";
    sb.Sheets[0].Columns(0).Width = 2 * 1440;
    sb.Sheets[0].Columns(1).Width = 1440;
    sb.Sheets[0].Columns(2).Width = 1440;
    sb.Sheets[0].Rows(0).Height = 1440/4;
    // Header row
    sb.Sheets[0].Cell(0,0).SetValue("Company Name");
    sb.Sheets[0].Cell(0,1).SetValue("Department Name");
    sb.Sheets[0].Cell(0,2).SetValue("Phone Number");

    // Data for the first row
    sb.Sheets[0].Cell(1,0).SetValue("Grapecity");
    sb.Sheets[0].Cell(1,1).SetValue("Sales Department");
    sb.Sheets[0].Cell(1,2).SetValue("(022) 777-8210");
    
    //Specify the cell range and set the format
    sb.Sheets[0].Cells(sb.Sheets[0].Cell(0, 0), sb.Sheets[0].Cell(0, 2)).FontBold = true;
    sb.Sheets[0].Cells(sb.Sheets[0].Cell(0, 0), sb.Sheets[0].Cell(1, 2)).FontName = "MS UI Gothic";
    
    // Save the Workbook to an Excel file.
    sb.Save (Application.StartupPath + @"\x.xls");
    MessageBox.Show(Application.StartupPath + @"Saved to" + "\x.xls.");
}

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    ' Add a sheet to the Sheets collection of the Workbook.
    Dim sb As New GrapeCity.SpreadBuilder.Workbook()
    sb.Sheets.AddNew()
    ' Set the properties, values, for columns, rows, and cells.
    With sb.Sheets(0)
        .Name = "Customer Call List"
        .Columns(0).Width = 2 * 1440
        .Columns(1).Width = 1440
        .Columns(2).Width = 1440
        .Rows(0).Height = 1440 / 4
        ' Header row
        .Cell(0, 0).SetValue("Company Name")
        .Cell(0, 1).SetValue("Department Name")
        .Cell(0, 2).SetValue("Phone Number")

        ' Data for the first row
        .Cell(1, 0).SetValue("Grapecity")
        .Cell(1, 1).SetValue("Sales Department")
        .Cell(1, 2).SetValue("(022) 777-8210")
    End With
    
    ' Specify the cell range and set the format
    sb.Sheets(0).Cells(sb.Sheets(0).Cell(0, 0), sb.Sheets(0).Cell(0, 2)).FontBold = True
    sb.Sheets(0).Cells(sb.Sheets(0).Cell(0, 0), sb.Sheets(0).Cell(1, 2)).FontName = "MS UI Gothic"
    
    ' Save the Workbook to an Excel file.
    sb.Save(Application.StartupPath & "\x.xls")
    MsgBox(Application.StartupPath & "Saved to" & "\x.xls")
End Sub