C#

mpavas wrote:

Now how can we make sure they do not use duplicate codes

void YourForm_FormClosing(object sender, FormClosingEventArgs e)
{
     if (e.CloseReason == CloseReason.WindowsShutDown)
     {
          // windows is shutting down
     }
}

Wong Shao Voon wrote:

Is event calling done in the caller or it is dispatched to be done at a later time?

Wong Shao Voon wrote:

OnTaskCompleted method, however if it is some more tasks to be done, OnTaskCompleted will call DoTask.

while(isThereMoreTask()){
    // do the task
    // fire the event
}