Task Await/Threading

[.paul.]

I have some code that i run in a background thread in a winforms app, but i need to convert it for an Asp.Net app...

tmr.Start() ' Timers don't work in Asp.Net
thread = New Threading.Thread(AddressOf DoWork, 20971520)
thread.IsBackground = True
thread.Start()

Private Sub DoWork()
    Dim game As New Game
    Application.DoEvents() ' Application DoEvents doesn't work in Asp.Net 
    n = game.createNew2()
End Sub

Private Sub tmr_tick(sender As Object, e As EventArgs) Handles tmr.Tick
    If Not thread.IsAlive Then ' this doesn't work properly
        tmr.Stop()
        ' update ui here
        ' etc
    End If
End Sub

Basically, I need to run the background thread with an increased stack size, then when it's completed, I need to update the ui.
This is a VS2019 app, so any improvements using async tasks and await would be appreciated...