Web View in Windows Form not loading

[altafJebran]

Hi Team,
I am trying to open webview in windows forms and i am using below versions of

and below code to load ADFS Url in webview so that user can key in username,password to authorize
Hi,

I am trying to load windows forms app if the user is succesfully logged into AD, For the same i am using
.NetCore3 preview 4

In Windows forms

var authResult = authContext.AcquireTokenAsync(resourceURI, clientID,
new Uri(clientReturnURI),
new PlatformParameters(PromptBehavior.Always, new CustomWebUi(SynchronizationContext.Current))); //Dispatcher.CurrentDispatcher

In

CustomWebUI Class

class CustomWebUi : ICustomWebUi
{

private readonly SynchronizationContext _dispatcher;
    public CustomWebUi(SynchronizationContext dispatcher)
    {
        _dispatcher = dispatcher ?? throw new ArgumentNullException(nameof(dispatcher));
    }

public Task AcquireAuthorizationCodeAsync(Uri authorizationUri, Uri redirectUr)
{
var tcs = new TaskCompletionSource();

        _dispatcher.Send(_ =>
        {
            //anything you wish.
            var webView = new WebView();
            webView.
            var w = new Window
            {
                Title = "Auth",
                WindowStyle = WindowStyle.ToolWindow,
                Content = webView,
            };
             w.Loaded += (sender, args) => webView.Navigate(authorizationUri);
	w.Loaded += (sender, args) => webView.NavigateToString("<title>sfsdf</title>");
            

	if (w.ShowDialog() != true && !tcs.Task.IsCompleted)
            {
                tcs.SetException(new Exception("canceled"));
            }
        }, null);

}
}

When i load it, It gives me below error. Can you please let me know where am i going wrong.

Thanks!