Don't raise TextChanged while continuous typing

Question

I have a textbox that has a fairly hefty _TextChanged event handler. Under normal typing condition the performance is okay, but it can noticeably lag when the u

Answer 1

You can mark your event handler as async and do the following:

bool isBusyProcessing = false;

private async void textBox1_TextChanged(object sender, EventArgs e)
{
    while (isBusyProcessing)
        await Task.Delay(50);

    try
    {
        isBusyProcessing = true;
        await Task.Run(() =>
        {
            // Do your intensive work in a Task so your UI doesn't hang
        });

    }
    finally
    {
        isBusyProcessing = false;
    }
}

Try try-finally clause is mandatory to ensure that isBusyProcessing is guaranted to be set to false at some point, so that you don't end up in an infinite loop.