How to convert http to https and other way around using global.asax ?

<%@ Application Language="C#" %>

<script runat="server">

    //Added by Alex on Jan 29,2014 to clear http/https issue  without enabling SSL Certificate
    private void RedirectToCorrectSSLScheme()
    {
        Uri pageRequest = Request.Url;
        string requestPath = pageRequest.GetLeftPart(UriPartial.Path).ToLower();

         requestPath = Server.UrlDecode(requestPath);
        // PageIsSecure returns if the given page should be secure or not. I 
        //maintain a list of secure pages or 
        //secure directory in an XML config. 
      //  bool securePage = GetSecurePages().PageIsSecure(requestPath);
        //Instead of localhost we can set the IP Address of Qatar server
        if (pageRequest.Scheme == "https" && pageRequest.Host.Contains("localhost") && requestPath.Contains(".aspx"))
        {
            Response.Redirect("http://" + pageRequest.Host + pageRequest.PathAndQuery, true);
           // Response.Redirect(requestPath, true);
        }
        //Added by Alex to check  external url of qatar server
        //Instead of localhost we can set the IP Address of Qatar server
        if (pageRequest.Scheme == "http" && pageRequest.Host.ToString()!="localhost"  && requestPath.Contains(".aspx"))
       
        {
           Response.Redirect("https://" + pageRequest.Host + pageRequest.PathAndQuery, true);

           //Response.Redirect(requestPath, true); 
        }
    }
    void  Application_BeginRequest(object sender, EventArgs e)
    {
        //Function Added by Alex on Jan 29,2014 to clear http/https issue under Qatar Server
        RedirectToCorrectSSLScheme();

    }

    void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup

    }
  
    
    
    void Application_End(object sender, EventArgs e) 
    {
        //  Code that runs on application shutdown

    }
        
    void Application_Error(object sender, EventArgs e) 
    { 
        // Code that runs when an unhandled error occurs

    }

    void Session_Start(object sender, EventArgs e) 
    {
        // Code that runs when a new session is started

    }

    void Session_End(object sender, EventArgs e) 
    {
        // Code that runs when a session ends. 
        // Note: The Session_End event is raised only when the sessionstate mode
        // is set to InProc in the Web.config file. If session mode is set to StateServer 
        // or SQLServer, the event is not raised.

    }
       
</script>