using rdp connection in the background like ssh

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C#

hi.
i have made a rdp application using c# in the reference of remote desktop using c#
in the application,activex control shows the screen of remote computer.i want the rdp connection running in the background,so i write the example code:
private MSTSCLib.MsTscAxNotSafeForScriptingClass rdp;
private void button1_Click(object sender, EventArgs e)
{
rdp6 = new MSTSCLib.MsTscAxNotSafeForScriptingClass();
rdp6.Server = "10.4.10.xxx";
rdp6.UserName = "user";
rdp6.IMsRdpClientNonScriptable_ClearTextPassword = "123";
rdp6.connect();
}
but some exeptions have occured.
the exception is :
BinaryPassword causes system.notImplemented exception.
BinarySalt causes system.notImplemented exception.

i want the rdp connection running in the backgroud and dont show the screen of remote computer.how can i do that?