How do I clean Internet Cookies and Cache using C# Windows application in VS 2005. .

Cache
How To Clear Internet Cache Using C#
Cookie
An easy way would be to use Environment.SpecialFolder enumeration to get the Cookies folder and then Delete all the files inside the folder

public void deleteCookies()
    {
        DirectoryInfo di = new DirectoryInfo(Environment.GetFolderPath(Environment.SpecialFolder.Cookies));
        foreach (FileInfo fl in di.GetFiles())
            fl.Delete();
    }

Credit goes to Clearing Internet Cookies In C#

Hope the above information helps.