C # Implementation of a simple web browser

Add the appropriate event response code for the corresponding control, complete with the following code:

using System;


using System.Collections.Generic;


using System.ComponentModel;


using System.Data;


using System.Drawing;


using System.Text;


using System.Windows.Forms;


using System.IO;


namespace Web browser


{


public partial class Form1:form


{


public Form1 ()


{


InitializeComponent ();


}


private void Navigate (string address)


{


if (string.isnullorempty)


return;


if (address. Equals ("About:blank")) return;


if (!address. StartsWith ("http://")) address = "http://" + address;


try {


cursor.current = cursors.waitcursor;


webbrowser1.navigate (new Uri (address));


}


catch (system.uriformatexception)


{return;}


finally {cursor.current = Cursors.Default;}


}


private void Form1_Load (object sender, EventArgs e)


{


toolstrip1.imagelist = ImageList1;


tbback.imageindex = 0;


Tbforward.imageindex = 1;


Tbrefrash.imageindex = 2;


Tbhome.imageindex = 3;


}


private void Combobox1_keydown (object sender, KeyEventArgs e)


{if (E.keycode = = keys.enter) {


Navigate (Combobox1.text);


ComboBox1.Items.Add (Combobox1.text);


}


}


private void Tbback_click (object sender, EventArgs e)


{


Webbrowser1.goback ();


}


private void Tbforward_click (object sender, EventArgs e)


{


Webbrowser1.goforward ();


}


private void Tbrefrash_click (object sender, EventArgs e)


{


I f (!webbrowser1.url.equals ("About:blank"))


　 {


Webbrowser1.refresh ();


}


}


private void Tbhome_click (object sender, EventArgs e)


{


Webbrowser1.gohome ();


}


private void ComboBox1_SelectedIndexChanged (object sender, EventArgs e)


{


Navigate (Combobox1.text);


}


private void Opens Toolstripmenuitem_click (object sender, EventArgs e)


{


Openfiledialog1.showdialog ();


Webbrowser1.documenttext = File.readalltext (Openfiledialog1.filename,encoding.getencodin ("gb2312"));


}


private void closes Toolstripmenuitem_click (object sender, EventArgs e)


{


This. Close ();


}


private void Form1_Resize (object sender, EventArgs e)


{


Webbrowser1.width = this. Width-25;


Webbrowser1.height = this. Height-130;


Combobox1.width = this. Width-55;


}


private void Toolstripbutton1_click (object sender, EventArgs e)


{


Webbrowser1.gosearch ();


}


}


}

(3) Procedure Description: This procedure only realizes a function simple Wen browser effect, the function formidable Wen Browser, is making, the goal gives the beginner a, the Mountain water diversion function.