Question

There are various buttons in my form and for each button press an action is associated with it.I want to measure the time between button is pressed and released (in millisecs).How can I do it for each button.

Answer 1

In the Form_Load event you can iterate all buttons and dynamically attach Stopwatch to each of them, then handle their MouseDown and MouseUp events:

this.Controls.OfType<Button>().ToList().ForEach(button =>
{
    button.Tag = new Stopwatch();
    button.MouseDown += new MouseEventHandler(button_MouseDown);
    button.MouseUp += new MouseEventHandler(button_MouseUp);
});

And the functions:

void button_MouseUp(object sender, MouseEventArgs e)
{
    Stopwatch watch = ((sender as Button).Tag as Stopwatch);
    watch.Stop();
    MessageBox.Show("This button was clicked for " + watch.Elapsed.TotalMilliseconds + " milliseconds");
    watch.Reset();
}

void button_MouseDown(object sender, MouseEventArgs e)
{
    ((sender as Button).Tag as Stopwatch).Start();
}