How to execute a console command from your app?

How do you execute a command in console from your application? so I can press a button and execure the dos command, shutdown -l to logoff, or something else.

Thanks

Code:

using System;
using System.Diagnostics;
using System.ComponentModel;

namespace MyProcessSample
{
    /// <summary>
    /// Shell for the sample.
    /// </summary>
    public class MyProcess
    {
       
        /// <summary>
        /// Opens the Internet Explorer application.
        /// </summary>
        public void OpenApplication(string myFavoritesPath)
        {
            // Start Internet Explorer. Defaults to the home page.
            Process.Start("IExplore.exe");
                    
            // Display the contents of the favorites folder in the browser.
            Process.Start(myFavoritesPath);
 
        }
        
        /// <summary>
        /// Opens urls and .html documents using Internet Explorer.
        /// </summary>
        public void OpenWithArguments()
        {
            // url's are not considered documents. They can only be opened
            // by passing them as arguments.
            Process.Start("IExplore.exe", "www.northwindtraders.com");
            
            // Start a Web page using a browser associated with .html and .asp files.
            Process.Start("IExplore.exe", "C:\\myPath\\myFile.htm");
            Process.Start("IExplore.exe", "C:\\myPath\\myFile.asp");
        }
        
        /// <summary>
        /// Uses the ProcessStartInfo class to start new processes, both in a minimized 
        /// mode.
        /// </summary>
        public void OpenWithStartInfo()
        {
            
            ProcessStartInfo startInfo = new ProcessStartInfo("IExplore.exe");
            startInfo.WindowStyle = ProcessWindowStyle.Minimized;
            
            Process.Start(startInfo);
            
            startInfo.Arguments = "www.northwindtraders.com";
            
            Process.Start(startInfo);
            
        }

        public static void Main()
        {
                    // Get the path that stores favorite links.
                    string myFavoritesPath = 
                    Environment.GetFolderPath(Environment.SpecialFolder.Favorites);
                
                    MyProcess myProcess = new MyProcess();
         
            myProcess.OpenApplication(myFavoritesPath);
            myProcess.OpenWithArguments();
            myProcess.OpenWithStartInfo();

               }    
    }
}

I used

System.Diagnostics.Process.Start("logoff");

thanks