C# Program to Validate Email Address

This is a simple C# .NET Program to validate email address. The ValildateEmail() function checks for a valid email and returns true if the email address is a valid email otherwise it returns false if the email address is not proper syntax. The code is well commented and should explain what is happening .

This code uses regular expressions to validate the structure of the email address and checks for the presence of “@” and “.” characters. Additionally, it has a separate function ContainsIllegalCharacters to check for the presence of any illegal characters in the email address.

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main()
    {
        string email = "[email protected]";
        bool isValid = ValidateEmail(email);

        if (isValid)
        {
            Console.WriteLine("Email is valid.");
        }
        else
        {
            Console.WriteLine("Email is invalid.");
        }
    }

    static bool ValidateEmail(string email)
    {
        // Define the regular expression pattern for a valid email address
        string pattern = @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$";

        // Check if the email matches the pattern
        if (Regex.IsMatch(email, pattern))
        {
            // Check for illegal characters
            if (ContainsIllegalCharacters(email))
            {
                return false;
            }

            return true;
        }

        return false;
    }

    static bool ContainsIllegalCharacters(string input)
    {
        // Define a pattern for acceptable characters in the email
        string acceptablePattern = @"^[a-zA-Z0-9._%+-@]+$";

        // Check if the input contains any illegal characters
        return !Regex.IsMatch(input, acceptablePattern);
    }
}

C# Program to Validate Email Address

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