How do I add go back and go forward buttons?

Firstly, what are you using? Winforms, WPF, ASP.NET, Silverlight? Which of these? Your question is listed under C# but it doesnt tell us what technology you are using...and that can make a difference to the answer.

Assuming you are using ASP.NET, add two buttons, set their background image to the icons of back and forward buttons and then write event handlers having Response.Redirect with the appropriate page urls.