Free Programming Tutorials & Source Code

Developing a multi-threading application in VB.NET is simple. This tutorial is directed to beginners who want to get involved into the multithreading application development. First, let's define the threading namespace:

 
 Imports System.Threading 

Using the Thread class of the System.Threading namespace to create, pause, delete, of resume a thread. Let create a thread:

 
 Private MyThread as Thread = New Thread(New ThredStart(TestThread))
 
 

Use the "Start" method to start the thread:

  
MyThread.Start()

TestThread is a Sub executed by all thread

 
 Sub TestThread()

 Dim strThread as String

Dim i as integer

For i =0 To 1000

strThread="Thread Number: " & i.ToString()

Comsole.WriteLine(strThread)

Next
 
 End Sub
 
 

In order to aboard a running thread, use the Abort method. Before you use it, make sure the thread is alive:

 
If MyThread.IsAlive Then

 MyThread.Abort()

End If
 
 

A Sleep method using to pause a thread:

 
MyThread.Sleep() 

To set up a thread priority, use the Priority method from the Thread class. ThreadPriproty property is used to set a thread pripority.Values of this property are: Normal, AboveNorma, BelowNormal, Highest, and Lowest. Here is an example of setting up a therad priority:

 
Private MyThread.Priority = ThreadPriority.Lowest
 

The Suspend method is used to suspend a thread. The thread remains suspended until Resume method is called. Suspend and Resume are methods of the Thread Class. Here is an example to suspend a thread:

If MyThread.ThreadState = ThreadState.Running Then

MyThread.Suspend()

End If 

And to resume a thread:

  
If MyThread.ThreadState = ThreadState.Suspended Then

MyThread.Resume()

End If

That's it!!