Migration V1 to V2

Hi,

in V1 I simply use:

        Public Function write(myFile As String) As MetaData
            Dim Client As DropNetClient = New DropNetClient(Konstanten.DropboxAppKey, Konstanten.DropboxAppSecret)
Client.UseSandbox = True
            Client.GetToken()
            Process.Start(Client.BuildAuthorizeUrl())
            MessageBox.Show("Wait")
            Try
                Dim accessToken = Client.GetAccessToken()
                Dim myFilestream As FileStream = New FileStream(myFile, FileMode.Open, FileAccess.Read)
                Dim myReturn As MetaData = Client.UploadFile("/", System.IO.Path.GetFileName(myFile), myFilestream)
                myFilestream.Close()
                Return myReturn
            Catch ex As Exception
                Return Nothing
            End Try

        End Function

How can  I get the token in V2 without entering the code by the user???