I'm working on a feature that needs to send two text messages with a 30 second delay, and it is crucial that both text messages are sent. Currently, this feature is built with ajax requests, that are sent with a 30 second javascript delay, but since this requires the user to have his browser open and left on the same page for at least 30 seconds, it is not a method I like. Instead, I have tried to solve this with threading.

This is what I've done:

Public Shared Sub Larma()
    Dim thread As New System.Threading.Thread(AddressOf Larma_Thread)
    thread.Start()
End Sub

Private Shared Sub Larma_Thread()
    StartaLarm()
    Thread.Sleep(1000 * 30)
    StoppaLarm()
End Sub

A web handler calls Larma(), and StartaLarm() and StoppaLarm() are the methods that send the first and second text messages respectively. However, I only get the first text message delivered - the second is never sent.

Am I doing something wrong here? I have no deep understanding of how threading works in ASP.NET, so please let me know how to accomplish this.