Webbrowser在鼠标选中的地方插入文本

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using mshtml;

// 添加引用.Net-Microsoft.mshtml
namespace WindowsApplication29
... {
public partial class Form1:Form
... {
public Form1()
... {
InitializeComponent();
this .webBrowser1.Navigate( " www.google.cn " );
}

private void button1_Click( object sender,EventArgse)
... {
IHTMLDocument2doc = (IHTMLDocument2) this .webBrowser1.Document.DomDocument;
IHTMLTxtRangerange = doc.selection.createRange() as IHTMLTxtRange;
range.pasteHTML(range.text + " <div>jinjazz路过</div> " );
}
}
}