请问跳转到一个友好异常页的有关问题

请教跳转到一个友好错误页的问题
程序如果出错，我一直是这样用的，现在我想跳转到一个单独的错误页面，然后显示错误信息，我在网上找了一下，说用
Global.asax,把代码写进去后，不知道这个出错的页面如何能跳到那个友好错误页？请教大家！谢谢。比如出错页为call.aspx,要跳转到errorpage.aspx,应该在call.aspx里怎么写代码呢？call.aspx在子目录里，errorpage.aspx在根目录里

C# code

      catch (Exception ex)        {            Response.Write("error.aspx?ErrorMsg=" + ex.Message.Replace("<br>", "").Replace("\n", "") + "&ErrorUrl=" + Request.Url.ToString().Replace("<br>", "").Replace("\n", ""));                    }

C# code

//这段代码是我网上找的，如果有不对的地方，指高手指出void Application_Error(object sender, EventArgs e)     {        Exception ex = Server.GetLastError().GetBaseException();        string errorTime = "发生时间：" + DateTime.Now.ToString();        string errorAddress = "发生异常页：" + Request.Url.ToString();        string errorInfo = "异常信息：" + ex.Message;        string errorSource = "错误源：" + ex.Source;        string errorTrace = "堆栈信息：" + ex.StackTrace;        Server.ClearError();        System.IO.StreamWriter writer = null;        try        {            lock (this)            {                //写入日志                 string year = DateTime.Now.Year.ToString();                string month = DateTime.Now.Month.ToString();                string day = DateTime.Now.Day.ToString();                string path = string.Empty;                string filename = DateTime.Now.ToString("yyyyMMdd") + ".txt";                path = Server.MapPath("~/Error/") + year + month + day;                if (!System.IO.Directory.Exists(path))                {                    System.IO.Directory.CreateDirectory(path);                }                System.IO.FileInfo file = new System.IO.FileInfo(path + "/" + filename);                writer = new System.IO.StreamWriter(file.FullName, true);//文件不在则创建，true表示追加                writer.WriteLine("用户IP:" + Request.UserHostAddress);                writer.WriteLine(errorTime);                writer.WriteLine(errorAddress);                writer.WriteLine(errorInfo);                writer.WriteLine(errorSource);                writer.WriteLine(errorTrace);                writer.WriteLine("-------------------------------------------------------");                           }        }        finally        {            if (writer != null)            {                writer.Close();            }        }        Server.Transfer("errorpage.aspx"); //跳转到显示友好错误的页面    }

C# code

catch (Exception ex)        {            Response.Write("../../error.aspx?ErrorMsg=" + ex.Message.Replace("<br>", "").Replace("\n", "") + "&ErrorUrl=" + Request.Url.ToString().Replace("<br>", "").Replace("\n", ""));                    }