string str = @"string WebsiteUrl = ""http://localhost:54361"";
            var configuration = Configuration.Default.WithDefaultLoader().WithCookies();
                var context = BrowsingContext.New(configuration);
                context.OpenAsync(WebsiteUrl).Wait();

               var elem=context.Active.QuerySelector<IHtmlAnchorElement>(""a.log-in"");
               if (elem==null) return context.Active.Body.InnerHtml;
               elem.Navigate().Wait();
                context.Active.QuerySelector<IHtmlFormElement>(""form"").Submit(new
                {
                    User = ""User"",
                    Password = ""secret""
                }).Wait();
            context.Active.QuerySelector<IHtmlAnchorElement>(""a.secret-link"").Navigate().Wait();

            return context.Active.QuerySelector(""p"").Text();
            ";

            string ИмяФайлаСборки = typeof(MainWindow).Assembly.Location;
            string Каталог = System.IO.Path.GetDirectoryName(ИмяФайлаСборки);

            var scr = Microsoft.CodeAnalysis.Scripting.ScriptOptions.Default
                .WithReferences(Каталог + @"AngleSharp.dll")
                //  .WithReferences(typeof(Configuration).Assembly)
                .WithImports("System", "AngleSharp", "AngleSharp.Dom.Html", "AngleSharp.Extensions");

            var result = Microsoft.CodeAnalysis.CSharp.Scripting.CSharpScript.EvaluateAsync(str, scr).Result;
            textBoxEval.AppendText(result + Environment.NewLine);
        }