Controlling cmd.exe from Winforms

This is the perfect answer:

using System;
using System.Windows.Forms;


namespace WindowsConsole
{


    public partial class Form1 : Form
    {
        System.Diagnostics.Process spdTerminal;
        System.IO.StreamWriter swInputStream;


        public delegate void fpTextBoxCallback_t(string strText);
        public fpTextBoxCallback_t fpTextBoxCallback;


        public Form1()
        {
            fpTextBoxCallback = new fpTextBoxCallback_t(AddTextToOutputTextBox);
            InitializeComponent();
        } // End Constructor


        public void AddTextToOutputTextBox(string strText)
        {
            this.txtOutput.AppendText(strText);
        } // End Sub AddTextToOutputTextBox


        private void btnQuit_Click(object sender, EventArgs e)
        {
            swInputStream.WriteLine("exit");
            swInputStream.Close();
            //spdTerminal.WaitForExit();
            spdTerminal.Close();
            spdTerminal.Dispose();
            Application.Exit();
        } // End Sub btnQuit_Click


        private void ConsoleOutputHandler(object sendingProcess, System.Diagnostics.DataReceivedEventArgs outLine)
        {
            if (!String.IsNullOrEmpty(outLine.Data))
            {
                //this.Invoke(new fpTextBoxCallback_t(AddTextToOutputTextBox), Environment.NewLine + outLine.Data);
                if(this.InvokeRequired)
                    this.Invoke(fpTextBoxCallback, Environment.NewLine + outLine.Data);
                else
                    fpTextBoxCallback(Environment.NewLine + outLine.Data);
            } // End if (!String.IsNullOrEmpty(outLine.Data))

        } // End Sub ConsoleOutputHandler


        private void btnExecute_Click(object sender, EventArgs e)
        {
            if (this.spdTerminal.HasExited)
            {
                MessageBox.Show("You idiot, you have terminated the process", "Error");
                return;
            } // End if (this.spdTerminal.HasExited)