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, EventArgs e)
         ... {
            IHTMLDocument2 doc  =  (IHTMLDocument2) this .webBrowser1.Document.DomDocument;
            IHTMLTxtRange range  =  doc.selection.createRange()  as  IHTMLTxtRange;
            range.pasteHTML(range.text + " <div>jinjazz 路过</div> " );
        }
    }
}