Only Number validation in Textbox Asp.net, Jquery, JavaScript

Pure Asp.net

Pure asp.net we have using Regular Expression Validator

The Regular Expression is ^\d+$

<form id="form1" runat="server">

    <div>

        <asp:TextBox ID="txtNo" ValidationGroup="OnlyNumber" runat="server"></asp:TextBox>

        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtNo"

            ErrorMessage="Please Enter Only Numbers" ValidationExpression="^\d+$" ValidationGroup="check"></asp:RegularExpressionValidator>

        <asp:Button ID="Button1" runat="server" ValidationGroup="check" Text="Submit "></asp:Button>

    </div>

    </form>

Jquery with asp.net

Only numbers can enter into that Textbox.

The next way is Jquery with asp.net flow the steps

Add the Jquery Reference

<script src=" http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>

<script type="text/javascript">

  $(document).ready(function () {

            $('input[numeric]').keyup(function () {

                var d = $(this).attr('numeric');

                var val = $(this).val();

                var orignalValue = val;

                val = val.replace(/[0-9]*/g, "");

                var msg = "Only Integer Values allowed.";

                if (val != '') {

                    orignalValue = orignalValue.replace(/([^0-9].*)/g, "")

                    $(this).val(orignalValue);

                    alert(msg);

                }

            });

        });

    </script>

    <asp:TextBox ID="txtCardno" numeric="integer"                                                runat="server"></asp:TextBox>

Javascript with asp.net

<script type="text/javascript">

    function numberOnlyExample() {

        if ((event.keyCode < 48) || (event.keyCode > 57))

            return false;

    }

</script>

Call this function in onKeyPress event of textbox.
Write this code in html source of textbox.

<asp:TextBox ID="TextBox1" onKeyPress="return validateNumbersOnly();"runat="server"></asp:TextBox>