Re: Message box in ASP.NET
There's no real direct conversion. In a web app, your VB code is executed on the server while the UI is displayed in a browser, possibly on the other side of the world. If you want to display a popup message to the user then you need to do so using JavaScript. In the most simple case, you can use the alert function. If you want something a bit more sophisticated then you can use something like the Dialog from jQuery UI:
https://jqueryui.com/dialog/
Re: Message box in ASP.NET
MessageBox.Show can only work when you have not deploy the app. Once deployed, everything run at server.
The alternative is to script manager.
ScriptManager.RegisterStartupScript(Page,Page.GetType(),"yourkek","alert('Hello');", True)
That's