请大家帮忙实现一个最简单的 URL 重写。解决思路

请大家帮忙实现一个最简单的 URL 重写。
用   VB   语法实现，在网上找了份代码，但是是   C#   的，搞了半天也没有搞定，请大家帮忙把下面代码转成   VB   的。
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using   System;
using   System.IO;
using   System.Web;
using   System.Web.UI;

namespace   ZDIL.URLRewriter
{
/**////   <summary>
///   URL重写  
///   </summary>
public   class   RewriterFactoryHandler   :   IHttpHandlerFactory
{
/**////   <summary>
///   GetHandler   is   executed   by   the   ASP.NET   pipeline   after   the   associated   HttpModules   have   run.     The   job   of
///   GetHandler   is   to   return   an   instance   of   an   HttpHandler   that   can   process   the   page.
///   </summary>
///   <param   name= "context "> The   HttpContext   for   this   request. </param>
///   <param   name= "requestType "> The   HTTP   data   transfer   method   ( <b> GET </b>   or   <b> POST </b> ) </param>
///   <param   name= "url "> The   RawUrl   of   the   requested   resource. </param>
///   <param   name= "pathTranslated "> The   physical   path   to   the   requested   resource. </param>
///   <returns> An   instance   that   implements   IHttpHandler;   specifically,   an   HttpHandler   instance   returned
///   by   the   <b> PageParser </b>   class,   which   is   the   same   class   that   the   default   ASP.NET   PageHandlerFactory   delegates
///   to. </returns>
public   virtual   IHttpHandler   GetHandler(HttpContext   context,   string   requestType,   string   url,   string   pathTranslated)
{
string   sendToUrl   =   url;                                                   //地址栏里面的地址
string   filePath   =   pathTranslated;

string   sendToURLString   =   "/user_web/test.aspx ";     //真正要访问的页面
string   queryString   =   " ";                                           //参数。比如   ?id=123

filePath   =   context.Server.MapPath(sendToURLString);   //物理地址

//这句最重要了。转向了。
context.RewritePath(sendToURLString,   String.Empty,   queryString);
                       
//这个还没有弄明白   :)
return   PageParser.GetCompiledPageInstance(url,   filePath,   context);
}

public   virtual   void   ReleaseHandler(IHttpHandler   handler)
{   //这个也不懂了
}
}
}



------解决方案--------------------
Public Overridable Function GetHandler(ByVal context As HttpContext, ByVal requestType As String, ByVal url As String, ByVal pathTranslated As String) As IHttpHandler