How to export csv file from windows ce device?

See more:

VB

SQL

WinCE

Hi I am doing a vs2008 smart device project for windows ce device. and i want to export the data to a csv file, when i do the transfer data i get an error.
I have attached my code,please give your suggestions

Private Sub BtnAvaStk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnTransData.Click
      
             Using cmd As New SqlCeCommand("SELECT * FROM ItemMaster")
           Using sda As New SqlCeDataAdapter()
               cmd.Connection = con
               sda.SelectCommand = cmd
               Using dt As New DataTable()
                   sda.Fill(dt)

                   'Build the CSV file data as a Comma separated string.
                   Dim csv As String = String.Empty

                   For Each column As DataColumn In dt.Columns
                       'Add the Header row for CSV file.
                       csv += column.ColumnName + ","c
                   Next

                   'Add new line.
                   csv += vbCr & vbLf

                   For Each row As DataRow In dt.Rows
                       For Each column As DataColumn In dt.Columns
                           'Add the Data rows.
                           csv += row(column.ColumnName).ToString().Replace(",", ";") + ","c
                       Next

                       'Add new line.
                       csv += vbCr & vbLf
                   Next


                   Dim folderPath As String = "F:\CSV\DataGridViewExport.csv"
                   File.WriteAllText(folderPath, csv)
                   '' File.OpenWrite(folderPath, csv)
               End Using
           End Using
       End Using
       ''End Using
   End Sub

What I have tried:

while executing error in .writealltext and showing as .writealltext is not a member of system.io.file