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

Kundnani.Rt
Posted by Kundnani.Rt under C# category on | Points: 40 | Views : 7893
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 !!!

Comments or Responses

Login to post response