using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using System.Diagnostics;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {   

            //declaring the commandlinestring as dir
            string commandlinestring = "dir";
            //declaring process as p
            Process p = new Process();
            //creating object sw of streamwriter
            StreamWriter sw;
            //creating object sr of StreamReader
            StreamReader sr;
            //creating object err of StreamReader
            StreamReader err;
            //declaring processstartinfo as psI and passing cmd text.
            ProcessStartInfo psI = new ProcessStartInfo("cmd");
            //setting UseShellExecute of the process to false enables you to redirect input, output, and error streams.
            psI.UseShellExecute = false;
            //setting true value indicating that the input for an application is read from the Process.StandardInput stream.
            psI.RedirectStandardInput = true;
            //setting true value of RedirectStandardOutput indicates the output of an application is written to the Process.StandardOutput stream.
            psI.RedirectStandardOutput = true;
            //setting ture value of RedirectStandardError indicates the error output of an application is written to the Process.StandardError stream.
            psI.RedirectStandardError = true;
            //setting true value to CreateNoWindow  indicating whether to start the process in a new window.
            psI.CreateNoWindow = true;
            //StartInfo specifies a set of values that are used when you start a process.Specifies a set of values that are used when you start a process.
            p.StartInfo = psI;
            //Starts a process resource and associates it with a Process component.
            p.Start();
            //assigning process standardinput to sw
            sw = p.StandardInput;
            //assigning process StandardOutput to sr
            sr = p.StandardOutput;
            //assigning process StandardError to err
            err = p.StandardError;
            //
            sw.AutoFlush = true;
            //checking for the condition that the commandlinestring is not empty string then writes the commandlinestring
            if (commandlinestring != "")
                sw.WriteLine(commandlinestring);
            else
                //execute default command
                sw.WriteLine("dir \\");
            sw.Close();
            //binding the full input data  to richtextbox
            richTextBox1.Text = sr.ReadToEnd();
            //binding the full output data to richtextbox
            richTextBox1.Text += err.ReadToEnd();
        }
    }
}