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Remote Desktop using C#.NET

, 11 Nov 2009 CPOL
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This article is about showing how to create a .NET application to perform remote desktop operation using Microsoft Terminal Services Client ActiveX control.


Remote Desktop Services is one of Microsoft Windows components to access a remote computer through the network. Only the user interface of the application is presented at the client. Any input is redirected over to the remote computer over the network.

At work, we use Remote Desktop a great deal. It allows us to login to a remote server to perform health checks, deploy applications, troubleshoot problems, etc. We also use remote desktop often when we do WFH (work from home).

Why do you want to write a .NET application to do this when you have the MS Terminal Services client available from OS? Well, consider if you want to work on 3 different application servers at the same time and want to toggle between these 3 servers quite often. With the MSTSC, we will be running 3 different clients for the 3 servers and it is difficult to manage the working environment. In .NET, you can develop an application with tab control to load remote desktop sessions in different tabs in one window.


We will be using AxMSTSCLib an ActiveX component in our program to connect to the remote computer. It’s not that hard to build a remote desktop application in .NET. Microsoft has a “Microsoft RDP client control” ActiveX control that we will be using in our application.

This is How We Do It

We will start by creating a Windows application in the Visual Studio IDE.

Add a reference to “Microsoft Terminal Services Control Type Library” from the COM tab. This will add MSTSCLib.dll to the project.

Sample Image - maximum width is 600 pixels

To add MSTSC to the toolbox, right click the toolbox and select “Choose Items…”. Now add “Microsoft Terminal Services control from the COM tab.

Sample Image - maximum width is 600 pixels

Drag the newly added control from toolbox to the form.

Add 3 textbox and 2 button controls to the form:

Sample Image - maximum width is 600 pixels

Connect Button - Click Event

Here is how we write the Connect button click event.

rdp.Server = txtServer.Text;
rdp.UserName = txtUserName.Text;
IMsTscNonScriptable secured = (IMsTscNonScriptable)rdp.GetOcx();
secured.ClearTextPassword = txtPassword.Text;

Now assign the properties (Server, UserName) of RDP control with the textbox values.

Here’s how easy it is to login to remote machine. However there is one catch, there is no direct method in RDP control through which you can pass the username and password to login to the remote desktop.

Due to security reasons, you have to implement an interface (IMsTscNonScriptable) to cast it separately.

IMsTscNonScriptable secured = IMsTscNonScriptable)rdp.GetOcx();
secured.ClearTextPassword = txtPassword.Text; 

Disconnect Button – Click Event

To disconnect from the remote desktop session, we just need to call the Disconnect() method.

Before disconnecting, we want to ensure that the connection is still available. We don't want to disconnect if it is already disconnected (very clever, huh).

if (rdp.Connected.ToString() == "1")

That’s all folks!


  • 5th November, 2009: Initial version


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Thiagarajan Alagarsamy
Web Developer
India India
Thiagu is living in Bangalore, India. He has started coding when he was 12 years old. His native is Madurai, a historic city in south India. He loves to code in C#. He frequents code project when he is not coding. Thiagu loves reading Dan Brown and Michael Crichton novels. He is very much interested in Artificial Intelligence (AI). To view his blog -

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Comments and Discussions

QuestionCheck out 2X Application Server Client Pin
paulgafa14-Jul-11 23:52
memberpaulgafa14-Jul-11 23:52 
GeneralRemote controle Pin
yacov859416-May-11 7:11
memberyacov859416-May-11 7:11 
GeneralHi. How to connect local resources Pin
Gasanov23-Apr-11 10:26
memberGasanov23-Apr-11 10:26 
GeneralRe: Hi. How to connect local resources Pin
tomcode14-Jun-11 21:10
membertomcode14-Jun-11 21:10 
GeneralRe: Hi. How to connect local resources Pin
Gasanov18-Jun-11 3:40
memberGasanov18-Jun-11 3:40 
GeneralRe: Hi. How to connect local resources Pin
mayakingka3-Apr-12 19:43
membermayakingka3-Apr-12 19:43 
GeneralMy vote of 3 Pin
qinghan198918-Apr-11 22:57
memberqinghan198918-Apr-11 22:57 
QuestionResolution and colors Pin
Jackman7116-Apr-11 21:53
memberJackman7116-Apr-11 21:53 
Hi I am very new to C# and found the example very interesting.
But how do I get the remote desktop to be shown in more colors and higher resolution?
Thanks for the help.
GeneralNo output Pin
Hasly15-Mar-11 0:49
memberHasly15-Mar-11 0:49 
GeneralMy vote of 5 Pin
jintao123413-Mar-11 17:34
memberjintao123413-Mar-11 17:34 
QuestionNeed to know how to logoff not just disconnect... Pin
Sukar10-Dec-10 9:19
memberSukar10-Dec-10 9:19 
QuestionHow to connect to remote desktop from console application? Pin
Tesic Goran10-Nov-10 3:40
memberTesic Goran10-Nov-10 3:40 
GeneralMy vote of 2 Pin
Dave Kreskowiak25-Sep-10 7:02
mvpDave Kreskowiak25-Sep-10 7:02 
Generalwithout logging out the user Pin
vdfoo24-Aug-10 23:13
membervdfoo24-Aug-10 23:13 
GeneralRe: without logging out the user Pin
Dave Kreskowiak25-Sep-10 7:00
mvpDave Kreskowiak25-Sep-10 7:00 
GeneralMy vote of 5 Pin
javiava6-Aug-10 0:29
memberjaviava6-Aug-10 0:29 
GeneralRDP server configuration Pin
Nanung1-Jul-10 16:53
memberNanung1-Jul-10 16:53 
GeneralGreat app...quick question about OnAuthenticationWarningDisplayed Event Pin
carlf22-Jun-10 9:27
membercarlf22-Jun-10 9:27 
QuestionMSTSCLib.dll and AxMSTSCLib - exist on every windows? Pin
elad21092-Jun-10 19:49
memberelad21092-Jun-10 19:49 
GeneralRemote desktop application in .net 2008 Pin
Member 439593714-May-10 0:03
memberMember 439593714-May-10 0:03 
GeneralOther port than 3389 Pin
johngreene12-May-10 6:13
memberjohngreene12-May-10 6:13 
GeneralRe: Other port than 3389 Pin
johngreene12-May-10 6:26
memberjohngreene12-May-10 6:26 
GeneralAutomated logoff via rdp (not jsut disconnection) Pin
elad21096-May-10 6:41
memberelad21096-May-10 6:41 
QuestionHow to Use this in internet Pin
syam@tnt25-Apr-10 8:54
membersyam@tnt25-Apr-10 8:54 
AnswerRe: How to Use this in internet Pin
Thiagarajan Alagarsamy6-May-10 19:00
memberThiagarajan Alagarsamy6-May-10 19:00 

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