Hi to all!

I'm trying to establish connection in a cisco router which is connected to a switching equipment using reverse telnet. The problem lies upon connection, for me to be prompted by <PLEASE ENTER USER ID by the system I must send Control F and Control G at the same time without an enter key. I'm getting no response from the switch equipment but doing it using the command prompt and telnet it manually it is successful.
Am i sending the correct codes for control F and control G?

Here is the code:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Connect("10.4.16.193 4001") '======IP, Port
Thread.Sleep(3000) '====wait
'SendData(Chr(94) & Chr(70)) 'sendata
SendData("^F")
End Sub

any help will be very much appreciated.