DataTable2CSV - Saving a DataTable to a CSV file

' Save the input DataTable to a CSV file. By default the values are Tab 
' delimited, but you can use the second overload version to use any other 
' string you want.
'
' Example:
'    Dim ds As New DataSet
'    SqlDataAdapter1.Fill(ds, "Users")
'    DataTable2CSV(ds.Tables("Users"), "D:\Users.txt")

Sub DataTable2CSV(ByVal table As DataTable, ByVal filename As String)
    DataTable2CSV(table, filename, vbTab)
End Sub
Sub DataTable2CSV(ByVal table As DataTable, ByVal filename As String, _
    ByVal sepChar As String)
    Dim writer As System.IO.StreamWriter
    Try
        writer = New System.IO.StreamWriter(filename)

        ' first write a line with the columns name
        Dim sep As String = ""
        Dim builder As New System.Text.StringBuilder
        For Each col As DataColumn In table.Columns
            builder.Append(sep).Append(col.ColumnName)
            sep = sepChar
        Next
        writer.WriteLine(builder.ToString())

        ' then write all the rows
        For Each row As DataRow In table.Rows
            sep = ""
            builder = New System.Text.StringBuilder

            For Each col As DataColumn In table.Columns
                builder.Append(sep).Append(row(col.ColumnName))
                sep = sepChar
            Next
            writer.WriteLine(builder.ToString())
        Next
    Finally
        If Not writer Is Nothing Then writer.Close()
    End Try
End Sub