C# how to change textbox value by loop?

Question

I need to create a script such as chronometer.

I write a code like following;

for(int i=0;i<50;i++)
{
    textBox.Text = i.Tostring();
    Task.Delay(100).Wait();
}

The expected output is like a chronometer ; an increasing text by 1 up to 49 started from 0 at textbox.

But I get only 49 after a 49*100 miliseconds pause later.

How can I solve this ?

If you can live with blocking the UI thread you could insert a textBox.Refresh();. BUT: You really shouldn't. So using a Timer is the regular solution; but the acepted answer is also correct. — TaW
– TaW, Commented Aug 27, 2016 at 11:01

Zein Makki · Accepted Answer · 2016-08-27 08:34:07Z

2

The event or method running this piece of code needs to be asynchronous. This is in order for the UI to be responsive:

private async void btnDoWork_Click(object sender, EventArgs e)
{
    for(int i=0;i<50;i++)
    {
        textBox.Text = i.Tostring();
        await Task.Delay(100);
    }
}

Otherwise, you'll be blocking the UI Thread and you will not be able to see the Text Box changing. You'll only see the last change which is 49 in your case.

answered Aug 27, 2016 at 8:34

Zein Makki

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