Write unique character(üûùúýýþ) via NetworkStream

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VB

How can i send text "üûùúýýþ" using network stream??

after i send it via networkstream, it become "???????" im using ASCII encoding. i try to change to Unicode encoding, and its not working.

This is my Code, its work fine with normal character like alphabets, numbes and symbols :

Public Sub SendRequest(ByVal str As String, ByVal cl As clsTcpClient)
    Try
        Dim strm As NetworkStream = cl.GetStream

        strm.Write(Encoding.ASCII.GetBytes(str), 0, str.Length)
        gvar_status = "Idle"
    Catch ex As Exception
        gvar_status = "Failed"
    End Try
End Sub

Thanks.