C# Remote desktop application using RDP. How to generate the certificate ?

Question

I have some problems to use the MSTSCLib to connect from 1 PC to another one.

It's working with Servers but not with normal Workstations...

    private void btn_connect_Click(object sender, EventArgs e)
    {
        try
        {
            rdp_control.Server = tbx_servername.Text;
            rdp_control.Connect();
            tabPage1.Text = "Connected";
        }
        catch (Exception exp)
        {
            MessageBox.Show(exp.ToString());
        }
    }

    private void btn_disconnect_Click(object sender, EventArgs e)
    {
        if (rdp_control.Connected.ToString() == "1")
        {
            rdp_control.Disconnect();
        }
    }

Both client and server applications are in the Same Network under the same NAT. Problem is the certificate,... I need to find a way to include the certificate. With the normal Remote Desktop from Windows, you see a MessageBox with the question:"Do you want to use this certificate.... blablabla" But this is not coming up with the RDP function in c#

Any Ideas? Thanks BR

Answer 1

Following code shows a simple RDP client and server.

RDP Server

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using RDPCOMAPILib;
using AxMSTSCLib;
using System.Runtime.InteropServices;

namespace TCP_to_RDP_Converter
{
    public partial class Form1 : Form
    {
        public static RDPSession currentSession = null;
        public static void createSession()
        {
            currentSession = new RDPSession();
        }

        public static void Connect(RDPSession session)
        {
            session.OnAttendeeConnected += Incoming;
            session.Open();
        }

        public static void Disconnect(RDPSession session)
        {
            session.Close();
        }

        public static string getConnectionString(RDPSession session, String authString, 
            string group, string password, int clientLimit)
        {
            IRDPSRAPIInvitation invitation =
                session.Invitations.CreateInvitation
                (authString, group, password, clientLimit);
                        return invitation.ConnectionString;
        }

        private static void Incoming(object Guest)
        {
            IRDPSRAPIAttendee MyGuest = (IRDPSRAPIAttendee)Guest;
            MyGuest.ControlLevel = CTRL_LEVEL.CTRL_LEVEL_INTERACTIVE;
        }

        /// <summary>
        /// Handle the form items
        /// </summary>
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            createSession();
            Connect(currentSession);
            textConnectionString.Text = getConnectionString(currentSession,
                "Test","Group","",5);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Disconnect(currentSession);
        }


    }
}

In order to use the RDP communication library you need to add rdpcompapi and Microsoft windows terminal services, form the COM references.

RDP Client

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using RDPCOMAPILib;
using AxRDPCOMAPILib;

namespace Simple_RDP_Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public static void Connect(string invitation, AxRDPViewer display, string userName, string password)
        {
            display.Connect(invitation, userName, password);
        }

        public static void disconnect(AxRDPViewer display)
       {
            display.Disconnect();
        }

        private void button1_Click(object sender, EventArgs e)
        {
             try
            {
                 Connect(textConnectionString.Text, this.axRDPViewer, "", "");
            }
            catch (Exception)
            {
                MessageBox.Show("Unable to connect to the Server");
            }
        }
    }
}

you can add reference to the AxRDPCOMAPILib by importing RDP viewer class component to the main form.

Full project can be downloaded from here [Download]: http://sandaruwmp.blogspot.com/2014/05/remote-desktop-application-with-rdp.html

Answer 2

use this....

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MSTSCLib;

namespace RemoteTool
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MSTerminalServiceControl1.Server = textBox1.Text;
            MSTerminalServiceControl1.UserName = textBox2.Text;
            IMsTscNonScriptable secured = (IMsTscNonScriptable)MSTerminalServiceControl1.GetOcx();
            secured.ClearTextPassword = textBox3.Text;
            MSTerminalServiceControl1.Connect();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            MSTerminalServiceControl1.Disconnect();
        }
    }
}