Question about AcquireWriterLock

maratin · January 19th, 2010, 05:56 PM

Hi all I need your help with understanding this issue.
Chapter 7, class Newsletter (BLL) ,
in function SendNewsletter :

Code:

 Lock.AcquireWriterLock(Timeout.Infinite);
   Newsletter.TotalMails = -1;
   Newsletter.SentMails = 0;
   Newsletter.PercentageCompleted = 0.0;
   Newsletter.IsSending = true;
   Lock.ReleaseWriterLock();

Why there is a lock? this code is not run by the new thread.

thanks

maratin · January 23rd, 2010, 07:20 PM

And also, as I understand only one thread can be created in the application domain in a same time (only one administrator can send the newsletter in a same time, others must wait).
In this case we need lock only on Newsletter.IsSending because only this static variable is shared.

So why there are also locks on Newsletter.PercentageCompleted if only one and only thread use it?