how to make text box use only numbers?

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C#

How to make a text box use only numbers and not letters?

Posted 17-Apr-13 0:44am

Shaun101640

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PrashantSonewane 17-Apr-13 6:45am

What kind of application? Windows or Web? Try using regex and let us know if have any issue.

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Prasad_Kulkarni · Answer 1 · 2013-04-17T00:46:00

Solution 1

Try this:

C#

void NumberValidation(object sender, KeyPressEventArgs e)
        {
            if ((e.KeyChar >= 48 && e.KeyChar <= 57))
            {
                e.Handled = false;
            }
            else
            {
                e.Handled = true;
            }
        }

Posted 17-Apr-13 0:46am

Prasad_Kulkarni

Comments

Monster Maker 17-Apr-13 6:50am

what about backspace??

CPallini · Answer 2 · 2013-04-17T00:47:00

Solution 2

You didn't try Google, did you?
Have a look, for instance, at this Stack Overflow question: "How do I make a textbox that only accepts numbers?"[^].

Posted 17-Apr-13 0:47am

CPallini

Comments

Johnny J. 17-Apr-13 9:08am

CP, Why are you directing him to Stack Overflow when there are at least 20 articles about it here on "our site"??? :-)

CPallini 17-Apr-13 12:58pm

:-)

Rockstar_ · Answer 3 · 2013-04-17T00:48:00

if Windows Application : In the textbox event :

C#

private void txtZip_KeyPress(object sender, KeyPressEventArgs e)
{
if (char.IsDigit(e.KeyChar) || char.IsControl(e.KeyChar))
{
e.Handled = false;
}
else
{
e.Handled = true;
}
}

if Web application :

XML

<head  runat="server">
    <title></title>
    <script language="javascript" type="text/javascript">
        function CheckNumeric(e) {

            if (window.event) // IE
            {
                if ((e.keyCode < 48 || e.keyCode > 57) & e.keyCode != 8) {
                    event.returnValue = false;
                    return false;

                }
            }
            else { // Fire Fox
                if ((e.which < 48 || e.which > 57) & e.which != 8) {
                    e.preventDefault();
                    return false;

                }
            }
        }

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <asp:textbox id="TextBox1" runat="server" onkeypress="CheckNumeric(event);"
             xmlns:asp="#unknown"></asp:textbox>
    </form>
</body></head>

how to make text box use only numbers?

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