I've just seen you post, so sorry for the late reply. The answer is yes, you can. Blazor WASM (Web Assembly) enables you to do just that. I have written an article recently that demonstrates this with WPF, however WinForms can do the same. Here is the article: Blazing.Mvvm - Blazor WASM & Blazor Hybrid using the Community Toolkit[^] - ignore the fact that the article focuses on MVVM. The key thing for you, in the article, is not only proof of concept, but also how you can interact with the Blazor part from within your WinForms app and vice versa. IT is made possible by the BlazorWebView control. Microsoft have an article that shows you how to host Blazor within WinForms: Build a Windows Forms Blazor app | Microsoft Learn[^]. Be aware though, to do this, you need to work with .Net 7.0+, not .Net Framework. However, if you need to move from .Net Framework to .Net, then your app will receive an immediate performance boost due to improvements made to .Net - no legacy support. Graeme "I fear not the man who has practiced ten thousand kicks one time, but I fear the man that has practiced one kick ten thousand times!" - Bruce Lee

You might consider using Stack versus List for charList. It has Push() (add to list), Peek() (look at the "topmost" list member), and Pop() (retrieve value and remove the topmost list member). It is just the sort of LIFO collection it sounds like you may want.