Winform – determine if mouse has left user control

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Hooking all the controls MouseEnter and MouseLeave events, then figuring out if it is still inside the form is pretty painful. A simple timer can get the job done too:

  public partial class Form1 : Form {
    private Timer mTimer;
    public Form1() {
      InitializeComponent();
      mTimer = new Timer();
      mTimer.Interval = 200;
      mTimer.Tick += mTimer_Tick;
      mTimer.Enabled = true;
    }
    private void mTimer_Tick(object sender, EventArgs e) {
      if (!this.DesktopBounds.Contains(Cursor.Position)) this.Close();
    }
  }

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