Экспорт из DataGridView в MS Excel 2003 - Visual Basic .NET

Public Class Form1
    Private Declare Function ShellEx Lib "shell32.dll" Alias "ShellExecuteA" ( _
        ByVal hWnd As Integer, ByVal lpOperation As String, _
        ByVal lpFile As String, ByVal lpParameters As String, _
        ByVal lpDirectory As String, ByVal nShowCmd As Integer) As Integer
 
    Private Sub exportExcel(ByVal grdView As DataGridView, ByVal fileName As String, _
        ByVal fileExtension As String, ByVal filePath As String)
 
        ' Choose the path, name, and extension for the Excel file
        Dim myFile As String = filePath & "\" & fileName & fileExtension
 
        ' Open the file and write the headers
        Dim fs As New IO.StreamWriter(myFile, False)
        fs.WriteLine("<?xml version=""1.0""?>")
        fs.WriteLine("<?mso-application progid=""Excel.Sheet""?>")
        fs.WriteLine("<ss:Workbook xmlns:ss=""urn:schemas-microsoft-com:office:spreadsheet"">")
 
        ' Create the styles for the worksheet
        fs.WriteLine("  <ss:Styles>")
        ' Style for the column headers
        fs.WriteLine("    <ss:Style ss:ID=""1"">")
        fs.WriteLine("      <ss:Font ss:Bold=""1""/>")
        fs.WriteLine("      <ss:Alignment ss:Horizontal=""Center"" ss:Vertical=""Center"" " & _
            "ss:WrapText=""1""/>")
        fs.WriteLine("      <ss:Interior ss:Color=""#C0C0C0"" ss:Pattern=""Solid""/>")
        fs.WriteLine("    </ss:Style>")
        ' Style for the column information
        fs.WriteLine("    <ss:Style ss:ID=""2"">")
        fs.WriteLine("      <ss:Alignment ss:Vertical=""Center"" ss:WrapText=""1""/>")
        fs.WriteLine("    </ss:Style>")
        fs.WriteLine("  </ss:Styles>")
 
        ' Write the worksheet contents
        fs.WriteLine("<ss:Worksheet ss:Name=""Sheet1"">")
        fs.WriteLine("  <ss:Table>")
        For i As Integer = 0 To grdView.Columns.Count - 1
            fs.WriteLine(String.Format("    <ss:Column ss:Width=""{0}""/>", _
            grdView.Columns.Item(i).Width))
        Next
        fs.WriteLine("    <ss:Row>")
        For i As Integer = 0 To grdView.Columns.Count - 1
            fs.WriteLine(String.Format("      <ss:Cell ss:StyleID=""1"">" & _
                "<ss:Data ss:Type=""String"">{0}</ss:Data></ss:Cell>", _
                grdView.Columns.Item(i).HeaderText))
        Next
        fs.WriteLine("    </ss:Row>")
 
        ' Check for an empty row at the end due to Adding allowed on the DataGridView
        Dim subtractBy As Integer, cellText As String
        If grdView.AllowUserToAddRows = True Then subtractBy = 2 Else subtractBy = 1
        ' Write contents for each cell
        For i As Integer = 0 To grdView.RowCount - subtractBy
            fs.WriteLine(String.Format("    <ss:Row ss:Height=""{0}"">", _
                grdView.Rows(i).Height))
            For intCol As Integer = 0 To grdView.Columns.Count - 1
                cellText = grdView.Item(intCol, i).Value
                ' Check for null cell and change it to empty to avoid error
                If cellText = vbNullString Then cellText = ""
                fs.WriteLine(String.Format("      <ss:Cell ss:StyleID=""2"">" & _
                    "<ss:Data ss:Type=""String"">{0}</ss:Data></ss:Cell>", _
                    cellText.ToString))
            Next
            fs.WriteLine("    </ss:Row>")
        Next
 
        ' Close up the document
        fs.WriteLine("  </ss:Table>")
        fs.WriteLine("</ss:Worksheet>")
        fs.WriteLine("</ss:Workbook>")
        fs.Close()
 
        ' Open the file in Microsoft Excel
        ' 10 = SW_SHOWDEFAULT
        ShellEx(Me.Handle, "Open", myFile, "", "", 10)
    End Sub
 
    Private Sub Form1_Load(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles MyBase.Load
        ' Create a couple of rows
        Dim row1() As String = New String() {"Joe", "Benjamin", vbNullString, "23"}
        Dim row2() As String = New String() {"Michael", "", "Brown", "32"}
        Dim row3() As String = New String() {"Phil", "Todd", "Lee", "42"}
 
        ' Add the rows to the DataGridView
        DataGridView1.Rows.Add(row1)
        DataGridView1.Rows.Add(row2)
        DataGridView1.Rows.Add(row3)
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        ' Call the export sub
        exportExcel(DataGridView1, "exportedData", ".xls", _
            My.Computer.FileSystem.SpecialDirectories.Desktop)
    End Sub
End Class