allow Only numeric Characters into Textbox

Question

5.00/5 (1 vote)

See more:

C#

ASP.NET

C#4.0

In My webpage I hav A Textbox Field,
In which I want to allow Only numeric Charecters,;How can i do it in c#

Posted 30-Jan-12 0:39am

Nimisha Mary John

Updated 30-Jan-12 0:46am

Rajesh Anuhya

v3

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8 solutions

Solution 4

use this javascript

C#

function onlyNumbers(evt)
{
    var e = event || evt; // for trans-browser compatibility
    var charCode = e.which || e.keyCode;

    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;

    return true;

}

Posted 30-Jan-12 0:54am

Abhi KA

Solution 7

Please check below code

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>

Posted 30-Jan-12 19:25pm

Nigam Patel

v2

Solution 5

You can do this with ajax also.

C#

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc" %>
<asp:TextBox ID="TextBox1" runat="server" AutoComplete="off"></asp:TextBox>

 <cc:FilteredTextBoxExtender ID="FilteredTextBoxExtender1"  runat="server"
    TargetControlID="TextBox1"         
   FilterType="Numbers" 
    />

Posted 30-Jan-12 0:56am

mohit _srivastava

Updated 30-Jan-12 0:59am

v3

Solution 6

C#

private void TextBox1_KeyPress(object sender, KeyPressEventArgs e)
       {
           if (char.IsControl(e.KeyChar)==false)
               if (char.IsDigit(e.KeyChar) == false)
               {
                   e.Handled = true;
                   TextBox1.Focus();
               }
       }

Posted 30-Jan-12 19:19pm

adithya.hari

Updated 30-Jan-12 21:28pm

v2

Solution 8

C#

private void textBox_KeyPress(object sender, KeyPressEventArgs e)
{
    string str = txtAge.Text;                               //  User Control
    int len = str.Length;
    int index=0;
    int dcml = 2;                                           // 2 indeicates the Deccimal Points Needed   (User Defined)
    if (str.Contains('.'))
    {
        index = str.IndexOf('.');
        index = len - index;
    }
    if (Char.IsControl(e.KeyChar) == false)
    {
        if (((Char.IsDigit(e.KeyChar)) && (index <= dcml)) || ((e.KeyChar == '.') && (!(str.Contains('.')))))
        {
        }
        else
        {
            e.Handled = true;
        }
    }
}

This Works Better.. It Accepts only Numbers and decimal Points upto 2 Decimal Places.. If you need to change the Decimal place.. you can edit in the code in 'dcml'.. change the "int dcml = 2" to whatever you like.

Posted 3-Mar-12 20:15pm

adithya.hari

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Jyothikarthik_N · Accepted Answer · 2012-01-30T00:41:00

Solution 1

Here's another question similar to yours.

how to restrict the user to enter alphabets in textbox without validators in web application?[^]

Posted 30-Jan-12 0:41am

Jyothikarthik_N

khan mohd faizan · Accepted Answer · 2012-01-30T00:52:00

please write javascript for allowing numeric only

C#

<pre>function AllowNumber(evt)// These function is used for Inserting only number
         {
            var charCode;
            charCode = (evt.which) ? evt.which : event.keyCode;
            if(charCode >=48 && charCode<=57)
            {
            return true;
            }
            else
            {
                alert("Please Enter Number Only");
                return false;
            }
         }

and call to your code like that

<pre><asp:textbox id="txtAMCAmount" runat="server" cssclass="TextBoxStyle" width="185px" onkeypress="return AllowNumber(this)" xmlns:asp="#unknown"></asp:textbox>

Abhinav S · Accepted Answer · 2012-01-30T00:41:00

Solution 2

See Numbers and Characters only Textbox Validation in C# ![^].