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How to validate an email address in C#?
There are several ways to validate an email address in C#.
System.Net.Mail −The System.Net.Mail namespace contains classes used to send electronic mail to a Simple Mail Transfer Protocol (SMTP) server for delivery.
System.Text.RegularExpressions − Represents an immutable regular expression.
Use the below expression
@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([azA-Z]{2,4}|[0-9]{1,3})(\]?)$"We can use the MailAddress class of the System.Net.Mail namespace to validate an email address
Example
using System;
using System.Net.Mail;
namespace DemoApplication{
class Program{
public static void Main(){
try{
string email = "hello@xyzcom";
Console.WriteLine($"The email is {email}");
var mail = new MailAddress(email);
bool isValidEmail = mail.Host.Contains(".");
if(!isValidEmail){
Console.WriteLine($"The email is invalid");
} else {
Console.WriteLine($"The email is valid");
}
Console.ReadLine();
}
catch(Exception){
Console.WriteLine($"The email is invalid");
Console.ReadLine();
}
}
}
}Output
The output of the above code is
The email is hello@xyzcom The email is invalid
Example using Regex −
We can also use regular expression to validate an email address.
Example
using System;
using System.Text.RegularExpressions;
namespace DemoApplication{
public class Program{
public static void Main(){
string email = "hello@xyz.com";
Regex regex = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-
9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$",
RegexOptions.CultureInvariant | RegexOptions.Singleline);
Console.WriteLine($"The email is {email}");
bool isValidEmail = regex.IsMatch(email);
if (!isValidEmail){
Console.WriteLine($"The email is invalid");
} else {
Console.WriteLine($"The email is valid");
}
Console.ReadLine();
}
}
}Output
The output of the above code is
The email is hello@xyz.com The email is valid
Updated on: 19-Aug-2020
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