SqlConnection - PlatformNotSupportedException

Hi!

When I'd like to use SqlConnection.Open() in a Pocket PC 2002 application, I get an error message - PlatformNotSupportedException. I've tryed it on Windows CE Emulator and my PDA Device, but the result was the same.
There is my code snippet:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim cn As New System.Data.SqlClient.SqlConnection("User ID=sa;password=sa;database=Test;server=192.168.1.5")

cn.Open()

Catch exSQL As SqlException

Dim errSQL As SqlError

For Each errSQL In exSQL.Errors

MessageBox.Show(errSQL.Message)

Next

Catch ex1 As Exception

MessageBox.Show(ex1.Message)

Finally

MessageBox.Show("test fail")
End Sub

When i try to build a windows application project with this code, it works well, Can anybody give me a tip, how can i solve the problem?
Thank's in advance.

Operating system: Windows XP professional + sp2
Development Tool: Visual Studion 2003
Database: MSDE 2000 Release A
PDA device: iPaq H3870, Windows CE 4.1