I\'m building this application in Visual Studio 2010 using C#.
Basically there are 2 files, form1.cs (which is the windows form) and program.cs (where all the logic
Don't know if it will work, but you could try to redirect console output.
Use Console.SetOut() and create derivative of TextWriter which overrides WriteLine() method and simply assign method parameter to your TextBox.Text Should work.
Console.SetOut()
TextWriter
WriteLine()
TextBox.Text