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Wednesday, October 15, 2014

Asp.net Email Address Validation Using Regular Expression

Email Address Validation for ASP.NET ( Validation Using Regular Expression):



In this post we learn how to use regular Expression in C#code for validation of Email id in asp.net web application. Some time we see many web sites use the Email validation in registration time, subscribe time etc. So how we can use Email validation in my asp.net web site.

Basically the JavaScript use for the validation in client site. But Asp.net also provide a validation class we can use this for check the valid information of not.


Asp.net Email Address Validation Using Regular Expression(parijat)


Asp:RegularExpressionValidator for Email address:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="EmailValidation_Csharp.aspx.cs"
    Inherits="EmailValidation_Csharp" %>

<!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>
    <title>Asp.net Regular Expression to validate Email Address</title>
    <style type="text/css">
        .style1
        {
            color: #990000;
            font-weight: bold;
        }
        .style2
        {
            color: #990000;
            text-decoration: underline;
            font-family: Arial, Helvetica, sans-serif;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div align="center">
    <h2 class="style2">Check valid Email-ID by C# code</h2>
    <table style="width: 396px; height: 128px; background-color: #00CCFF">
        <tr>
            <td>
                <span class="style1">Enter Email:</span>
            </td>
            <td align="left">
                <asp:TextBox ID="txtEmail" runat="server" Width="195px" />
            </td>
        </tr>
        <tr>
            <td>
            </td>
            <td align="left" valign="top">
                <asp:Button ID="btncheck" runat="server" Text="Validate Email"
                    Height="31px"
                    style="color: #990000; font-weight: 700" onclick="btncheck_Click" />
                <br />
                <br />
    <asp:Label ID="lblmsg" runat="server" Style="font-weight: bold;" />
            </td>
        </tr>
    </table>
    <br />
    This Example in <a href="http://asp-net-by-parijat.blogspot.in/">Asp.net Tutorial
        </a>
        <br />
    </div>
    </form>
</body>
</html> 

Validate an email address using c#:

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

public partial class EmailValidation_Csharp : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btncheck_Click(object sender, EventArgs e)
    {

        bool isEmail = Regex.IsMatch(txtEmail.Text.Trim(), @"\A(?:[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?\.)+[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?)\Z");
        if (!isEmail)
        {
            lblmsg.Text = "Enter Valid Email ID..";
            lblmsg.ForeColor = System.Drawing.Color.Red;
            return;
        }
        else
        {
            lblmsg.Text = "Valid Email";
            lblmsg.ForeColor = System.Drawing.Color.Green;
        }
    }
}




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