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private string makeUrlAbsolute(string url)
        {
            isWebPartPropertiesError = false;
            try
            {
                if (!string.IsNullOrEmpty(url))
                {
                    bool shouldCheckForRootWeb = false;

                    if (!url.StartsWith("http://"))
                    {
                        if (url.StartsWith("//")) throw new Exception("Неправильная ссылка");
                        if (!url.StartsWith("/")) url = url.Insert(0, "/");
                        url = url.Insert(0, SPContext.Current.Site.Url);
                        shouldCheckForRootWeb = true;
                    }
                    using (SPSite site = new SPSite(url))
                    {
                        using (SPWeb web = site.OpenWeb())
                        {
                            if (!url.Contains(web.Url)) isWebPartPropertiesError = true;
                            if (shouldCheckForRootWeb && site.Url.Equals(web.Url)) isWebPartPropertiesError = true;
                            return url;
                        }
                    }
                }
                else return "";
            }
            catch
            {
                isWebPartPropertiesError = true;
                return "";
            }

            //this.CatalogIconImageUrl = this.ClassResourcePath + "/Test.ico";
            //this.TitleIconImageUrl = this.ClassResourcePath + "/Test.ico";
        }