The use of C # Help control HelpProvider

Using system;using system.collections.generic;using system.componentmodel;using system.data;using System.Drawing; Use system.linq;using system.text;using system.windows.forms;namespace help control using {public    partial class Form1:form    {public        Form1 ()        {            InitializeComponent ();        }        HelpProvider HP;        private void Form1_Load (object sender, EventArgs e)        {            MessageBox.Show ("To get help, press F1");            HP = new HelpProvider ();            String Source = "Help.txt";            Hp. HelpNamespace = Source;            Hp. Setshowhelp (this, true);}}}    

The use of C # Help control HelpProvider