C# Create GUI for console app

Hello, I am in need of an interface, coded in C# which will allow me to send commands to a console application, as if i was typing in the console itself. You will have to make use of the STDIN and STDOUT streams of the application. The GUI, needs 1 textbox for commands. 1 button, to send the command in the textbox, to the console application. 1 (rich)textbox where console output will be placed. Thats it! This is the application in question: <[login to view URL]> Note, this is not as simple as it might seem, I have already attempted this myself, however i cant get it right properly. I expect the application to function properly, so its not enough to just send the commands to STDIN and leave it at that. It has to work too. Everything that happens in the console window, must happen in the GUI as well. Also note, i will not accept anything other then pure c# code. No external programs/dll's allowed. Good luck!