public string getUrl()
        {
            string tempUrl = HttpContext.Current.Request["url"];
            if (tempUrl == null || tempUrl.Trim() == "")
            {
                this.currentUrl = HttpContext.Current.Request.UrlReferrer;
            }
            else
            {
                if(tempUrl == HttpContext.Current.Request.UrlReferrer)
                    this.currentUrl = "Default.aspx";
                else
                    this.currentUrl = tempUrl;
            }
            if (this.currentUrl == null || this.currentUrl.Trim() == "")
                this.currentUrl = "Default.aspx";
            return this.currentUrl;
        }