Validating Mobile Number in ASP.NET Page TextBox using Regex in C#

Posted by Kundnani.Rt under C# category on 2/12/2013 | Points: 40 | Views : 10278

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C# has provided

Regex

class for pattern matching and verifications.

Regex

class requires

System.Text.RegularExpressions

system namespace.

The foll. code demonstrates how to validate a mobile number (Indian) using C# Code Behind File.

HTML Front-End Code is:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="MobileNumberVerification._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Enter Your Mobile Number: "></asp:Label>
        &nbsp; <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Validate Number" OnClick="Button1_Click" />
        <br />
        <br />
        <br />
        <asp:Label ID="Label2" runat="server" Text="Valid Mobile Number"></asp:Label>
        <br />
        <br />
        <asp:Label ID="Label3" runat="server" Text="Invalid Mobile Number"></asp:Label>
    </div>
    </form>
</body>
</html>

Code Behind File is:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace MobileNumberVerification
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Label2.Visible = false;
            Label3.Visible = false;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string patternForMobile = @"^\d{10}$";

            Regex rgx = new Regex(patternForMobile, RegexOptions.IgnoreCase);
            MatchCollection matches = rgx.Matches(TextBox1.Text);
            if (matches.Count > 0)
            {
                Label2.Visible = true;
                Label3.Visible = false;
            }
            else
            {
                Label3.Visible = true;
                Label2.Visible = false;
            }
        }
    }
}

Code-Behind Justification:


Regex rgx = new Regex(patternForMobile, RegexOptions.IgnoreCase);
MatchCollection matches = rgx.Matches(TextBox1.Text);

We are first creating

Regex

class object and then

MatchCollection

class to get the matches !!!

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