Question

I’m using a timer to reset a lable I use as a warning box. Basically, if the user does something (more specifically, something goes wrong, ex : He uses a word not recognized by the program), this catches what went wrong early and returns to him what happened so he can change the input.

The reset blanks out the label after 5 seconds to prevent him from seeing something like “please do not use chinese characters” and maybe still thinking an old error is still up. This is what I got reading the invoke (since I hear begininvoke requires an endinvoke, I chose invoke).

private void lblWrn_TextChange(object sender, EventArgs e)
{
    Timee = new System.Timers.Timer(5000);
    Timee.Elapsed += new ElapsedEventHandler(timerClearWrn);
    Timee.Enabled = true;
}

string empty = "";
private void timerClearWrn(object sender, ElapsedEventArgs elapsed)
{
    lblWrn.Invoke(new Action<Label>(lblWrn), new object[] { lblWrn, "" });
}

I am not too sure where I am going wrong with this, and looking up examples, cannot figure out which part to change. Can someone explain to me the error or invoke a bit more?

Answer 1

If it’s a Windows Forms application, use System.Windows.Forms.Timer, then you don’t need Invoke, as the timer callback is executed on the main thread.

Also, don’t create a new timer on every text change.