static void Tong(int a, int b, ShowLog log) { int result = a + b; log?.Invoke($"Tong la {result}"); }
private void ShowLogButton_Click(object sender, EventArgs e) { ShowLog?.Invoke(); }
static void Tong(int a, int b, ShowLog log) { int result = a + b; log?.Invoke($"Tong la {result}"); }
private void ShowLogButton_Click(object sender, EventArgs e) { ShowLog?.Invoke(); }