how to change the url from http to https in browser

protected void Application_BeginRequest(object sender, EventArgs e)
      {
          string path = HttpContext.Current.Request.Url.AbsolutePath;

          if (HttpContext.Current.Request.ServerVariables["HTTPS"] == "on")
          {
              if (SecurePath.IsSecure(path))
              {
                  //do nothing
              }
              else
              {
                  HttpContext.Current.Response.Redirect(HttpContext.Current.Request.Url.AbsoluteUri.Replace("https://", "http://"));
                  return;
              }
          }

          if (HttpContext.Current.Request.ServerVariables["HTTPS"] != "on")
          {
              if (SecurePath.IsSecure(path))
              {
                  //Redirect to https version
                  HttpContext.Current.Response.Redirect(HttpContext.Current.Request.Url.AbsoluteUri.Replace("http://", "https://"));
              }
          }


      }

#region "SecurePath Class"
public class SecurePath
{

    public static bool IsSecure(string path)
    {
        List<securepage> lstPages = new List<securepage>();

        bool isSecure = false;

        try
        {
            //Fill the list of pages defined in web.config
            NameValueCollection sectionPages = (NameValueCollection)ConfigurationManager.GetSection("SecurePages");

            foreach (string key in sectionPages)
            {
                if ((!string.IsNullOrEmpty(key)) && (!string.IsNullOrEmpty(sectionPages.Get(key))))
                {
                    lstPages.Add(new SecurePage { PathType = sectionPages.Get(key), Path = key });
                }
            }

            //loop through the list to match the path with the value in the list item
            foreach (SecurePage page in lstPages)
            {
                switch (page.PathType.ToLower().Trim())
                {
                    case "directory":
                        if (path.Contains(page.Path))
                        {
                            isSecure = true;
                        }
                        break;
                    case "page":
                        if (path.ToLower().Trim() == page.Path.ToLower().Trim())
                        {
                            isSecure = true;
                        }
                        break;
                    default:
                        isSecure = false;
                        break;
                }
            }
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }

        return isSecure;
    }
}
#endregion
</securepage></securepage>

#region "SecurePage Class"
   public class SecurePage
   {
       string _path = "";
       string _pathType = "";

       public string Path
       {
           get { return this._path; }
           set { this._path = value; }
       }

       public string PathType
       {
           get { return this._pathType; }
           set { this._pathType = value; }
       }
   }
   #endregion

<SecurePages>

     <add key="/Login.aspx" value="page" />

   <add key="/WebResource.axd" value="page"/>
   <add key="/ScriptResource.axd" value="page"/>
     
 </SecurePages>