want to enter integer only

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.NET2.0

Hi all,

I selected a textbox and want to enter only integer value.
Eg like a phone number.

How could I do that.

kudos
neaS

Posted 20-Oct-11 22:53pm

neeraj24may

Updated 20-Oct-11 23:15pm

Dalek Dave

v2

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Comments

BobJanova 21-Oct-11 5:33am

WinForms? WPF? Web?

Also, phone numbers are, in general, not 'integers'. They are strings which consist mostly of numbers but also other characters. For example: "01234 567890" or "+353 1 2345 6789". Even removing the other characters, in many countries the national version of any number starts with '0' which will be lost if you represent it as a number.

(As an aside, I wonder how many calls that number gets. It is a valid Bedford number, though I suppose it probably isn't allocated.)

7 solutions

Solution 1

You can use javascript for that

try this

JavaScript

function checkIt(evt) {
    evt = (evt) ? evt : window.event
    var charCode = (evt.which) ? evt.which : evt.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        status = "This field accepts numbers only."
        return false
    }
    status = ""
    return true
}

Posted 20-Oct-11 22:56pm

P.Salini

v2

Solution 3

By using javascript you can do it

function NumOnly(ctrl) {
            chr = document.getElementById(ctrl).value;

            var reg1 = /.*[a-zA-Z].*/;
            if (document.getElementById('<%=txtMobile.ClientID %>').value == "")
                return;
            if (reg1.test(chr)) {
                document.getElementById(ctrl).value = "";
                alert("Enter numbers only");
                document.getElementById(ctrl).focus();

            }

        }

XML

<asp:TextBox ID="txtMobile" runat="server" Width="159px" TabIndex="17" onkeypress='NumOnly(this.id)' MaxLength="10"></asp:TextBox>

Posted 20-Oct-11 23:00pm

sravani.v

Updated 20-Oct-11 23:02pm

v2

Solution 4

Hi

pls use the Regular Expression validator on that text box

For Example
http://asp.net-tutorials.com/validation/regular-expression-validator/

http://asp-net-example.blogspot.com/2009/02/aspnet-regularexpressionvalidator_7607.html
Thanx

Posted 20-Oct-11 23:11pm

shijuse

Updated 20-Oct-11 23:12pm

v2

Comments

Dalek Dave 21-Oct-11 5:16am

Is how I would do it!

Solution 5

C#

public static void CheckNumeric(System.Windows.Forms.KeyPressEventArgs kv, Boolean myCurrency)
        {
            if (!myCurrency)
            {
                if ((kv.KeyChar < (char)48 || kv.KeyChar > (char)57) && (kv.KeyChar != (char)8))
                    kv.Handled = true;

            }
            else
            {
                if ((kv.KeyChar < (char)48 || kv.KeyChar > (char)57) && (kv.KeyChar != (char)8) && (kv.KeyChar != (char)46))
                    kv.Handled = true;
            }

        }

use this code in keypress event of textbox

Posted 20-Oct-11 23:18pm

Menon Santosh

Updated 20-Oct-11 23:27pm

v2

Solution 6

C#

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{

    if (this.textBox1.ReadOnly) return;

    if ((int)e.KeyChar < 32) return;

    if (!char.IsDigit(e.KeyChar) && (int)e.KeyChar != 46) //46=> .
    {
        e.Handled = true;
        return;
    }

}

Posted 20-Oct-11 23:31pm

ohkuy

Solution 7

Beginning with .NET 2.0, you have the MaskedTextBox Control which is ready-to-go for such tasks as entering phone numbers.

Drop one on a WinForm, and select its 'Mask property: open the pop-up window to select from a number of pre-defined templates.

In .NET 4.0, there are two phone-number options to choose from (I don't know what the options were in .NET 2.0).

For numeric entry, as mentioned by Wayne Gaylard above, use a NumericUpDownControl.

best, Bill

Posted 21-Oct-11 0:39am

BillWoodruff

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Wayne Gaylard · Accepted Answer · 2011-10-20T22:58:00

My advice would be to use a NumericUpDown control which only accepts integers. If you have to use a text box, then you are going to have to handle the KeyPress event and intercept any letters or synmbols entered. Something like this

C#

if(!char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar))
              e.Handled = true;

Hope this helps