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Multithreading in C#.NET and Add Items Into the ListBox Control

Posted by Sreejith A.K
Monday, April 5, 2010
comments (0)

#region Start Mail Delevery
///


/// Start Mail Delevery

private void btnStart_Click(object sender, EventArgs e)
{
StartMailThreading();
}
#endregion

#region Start Mail Threading
///
/// Start Mail Threading
///
public void StartMailThreading()
{
// Create the worker thread and start it
ThreadStart starter = new ThreadStart(this.UpdateListBox);
Thread t = new Thread(starter);
t.Start();
// Loop 4 times, adding a message to the ListBox each time
for (int i = 0; i < 4; i++) ;
{
this.listBoxSendItems.Items.Add("Campaign Started");
this.listBoxSendItems.Update();
// Process any queued events on the UI thread
Application.DoEvents();
// Suspend processing for 1 second
Thread.Sleep(1000);
}
this.listBoxSendItems.Items.Add("Last message from UI thread");
this.listBoxSendItems.Update();
}
#endregion

#region Update ListBox Control
///
/// Update ListBox Control
///
public void UpdateListBox()
{
for (int j = 0; j < 20; j++)
{
// Set the message to be added to the ListBox from the worker
// thread
this.Message = "Worker thread loop count = " + j.ToString();
// Invoke the WorkerUpdate method in the ListBox’s thread
// context
this.listBoxSendItems.Invoke(new EventHandler(WorkerUpdate));
Thread.Sleep(100);
}
}
#endregion

#region WorkerUpdate
// The delegate that’s called from the worker thread
// to update the ListBox
public void WorkerUpdate(object sender, EventArgs e)
{
this.listBoxSendItems.Items.Add(this.Message);
this.listBoxSendItems.Update();
}
#endregion

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