insert string to an open command prompt window from vb code

I want to thank you all I will try all and both solutions exists and fpr the comment I am trying to make an openvpn cliemt and pass the username and password to the openvpn.exe here is the code I know there is a directive from openvpn.exe but the forum is not answered yet, if you know which directive is I would appreciate it <pre lang="vb">If ComboBox1.Text = "" Then
            MsgBox("Select server file from combobox", MsgBoxStyle.OkOnly, "error")
        Else
            openvpnProcess.StartInfo.CreateNoWindow = True
            If CheckBox1.Checked = True Then
                openvpnProcess.StartInfo.WindowStyle = ProcessWindowStyle.Normal
            Else
                openvpnProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden
            End If

            openvpnProcess.EnableRaisingEvents = True
                       openvpnProcess.StartInfo.Arguments = "--config " & Me.ComboBox1.SelectedItem & ""
'openvpnProcess.StartInfo.Arguments = "--password foo " this directive is correct?
                       openvpnProcess.StartInfo.FileName = "C:\Program Files\OpenVPN\bin\openvpn.exe"
            openvpnProcess.StartInfo.WorkingDirectory = "C:\Program Files\OpenVPN\config\"
            openvpnProcess.Start()</pre>
please any help and or tutorial