Question

Suppose you have a button on a form that counts to 1000 in a textbox and then clears it.

If I quickly click the button five times (in runtime) the Click event handler will be called 5 times and I will see the count to 1000 five times.

Is it possible to disable other clicks on that button while the first click is counting?

Note: Disabling the button in the first statement of the click handler and then re-enabling at the end does not work. Also, unsubscribing/subscribing to the click event (the -= followed by +=) does not work.

Here a sample to illustrate:

  private bool runningExclusiveProcess = false;

    private void button1_Click(object sender, EventArgs e)
    {
        this.button1.Click -= new System.EventHandler(this.button1_Click);

        if (!runningExclusiveProcess)
        {
            runningExclusiveProcess = true;
            button1.Enabled = false;


            textBox1.Clear();
            for (int i = 0; i < 1000; i++)
            {
                textBox1.AppendText(i + Environment.NewLine);
            }


                runningExclusiveProcess = false;
            button1.Enabled = true;
        }

        this.button1.Click += new System.EventHandler(this.button1_Click);
}

Answer 1

Just disable button after initial click, run a timer for a second which will on tick reenable the button and disable itself