You are creating a Windows application by using the .NET Framework 3.5.You plan to
create a form that might result in a time-consuming operation. You use the
QueueUserWorkItem method and a Label control named lblResult.You need to update the
users by using the lblResult control when the process has completed the operation.Which
code segment should you use?

A.
private void DoWork(object myParameter)
{
// thread work
this.Invoke(new MethodInvoker(ReportProgress));
}
private void ReportProgress()
{
this.lblResult.Text = “Finished Thread”;
}

B.
private void DoWork(object myParameter)
{
// thread work
this.lblResult.Text = “Finished Thread”;
}

C.
private void DoWork(object myParameter)
{
// thread work System.Threading.Monitor.Enter(this);
this.lblResult.Text = “Finished Thread”; System.Threading.Monitor.Exit(this);
}

D.
private void DoWork(object myParameter)
{
// thread work System.Threading.Monitor.TryEnter(this);
ReportProgress();
}
private void ReportProgress()
{
this.lblResult.Text = “Finished Thread”;
}