Zip code size test C#

Question

I have a small piece of code that I have been trying to get to work, but nope. So I've come to the experts. I'm trying to test a zip code entry and limit it to 5 digits only. My first issue is with the attached code. It doesn't seem to be counting the length properly. Also, how can I limit the user so if they try to type a 6th character, it won't show or be accepted?

private void textBoxZip_TextChanged(object sender, EventArgs e)
    {
        String userInputString;
        int length,
            max = 5;

        userInputString = textBoxZip.Text;
        numberTest(userInputString);

        length = userInputString.Length;
        if (length > max)
        {
            labelErrorMessage.Text = "Maximum length 5 numbers";
        }
    }

score 0 · Answer 1 · answered Apr 19 '13 at 04:07

0

You should look at events KeyDown and KeyPress. See example in MSDN Control.KeyPress Event

answered Apr 19 '13 at 04:07

Lex

319
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score 0 · Answer 2 · answered Apr 19 '13 at 04:09

0

If you are in a WinForms application, you can limit a textbox's length by setting the MaxLength property.

answered Apr 19 '13 at 04:09

Narsters

596
5
4

score 0 · Accepted Answer · answered Apr 19 '13 at 04:12

0

I think using a MaskedTextBox would be an easy solution. This will allow you to easily accept only a certain # of characters in a specified format.

The MaskedTextBox is a standard .NET control in the control toolbar in Visual Studio.

answered Apr 19 '13 at 04:12

Inisheer

20,376
9
50
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This was a great suggestion as it corrected a couple of issues I had elsewhere. Question though. Is there a way to make the ________ go away? I just want a blank space. – user2297683 Apr 19 '13 at 17:33
Unfortunately, I don't know of a way to get rid of that line. – Inisheer Apr 19 '13 at 18:02
Found the answer here: http://stackoverflow.com/questions/1459797/hiding-the-promptchar-for-nets-maskedtextbox – user2297683 Apr 19 '13 at 18:23

Zip code size test C#

3 Answers3