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 = “Finishe 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 = “Finishe Thread”;
}