C# Online Compiler | .NET Fiddle

using System;

class Program
{
	static void Main(string[] args)
	{
		string email = "myemail@email.com";
		bool isValid = ValidateEmail(email);
		
		Console.WriteLine($"Is {email} a valid email? {isValid}");
	}

	static bool ValidateEmail(string email)
	{
		if (string.IsNullOrWhiteSpace(email))
		{
			return false;
		}

		string[] parts = email.Split('@');
		if (parts.Length != 2)
		{
			return false; // email must have exactly one @ symbol
		}

		string localPart = parts[0];
		string domainPart = parts[1];
		if (string.IsNullOrWhiteSpace(localPart) || string.IsNullOrWhiteSpace(domainPart))
		{
			return false; // local and domain parts cannot be empty
		}

		// check local part for valid characters
		foreach (char c in localPart)
		{
			if (!char.IsLetterOrDigit(c) && c != '.' && c != '_' && c != '-')
			{
				return false; // local part contains invalid character
			}
		}

		// check domain part for valid format
		if (domainPart.Length < 2 || !domainPart.Contains(".") || domainPart.Split(".").Length !=2 ||  domainPart.EndsWith(".") || domainPart.StartsWith("."))
		{
			return false; // domain part is not a valid format
		}

		return true;
	}
}

 
using System;
​
class Program
{
    static void Main(string[] args)
    {
        string email = "myemail@email.com";
        bool isValid = ValidateEmail(email);
        
        Console.WriteLine($"Is {email} a valid email? {isValid}");
    }
​
    static bool ValidateEmail(string email)
    {
        if (string.IsNullOrWhiteSpace(email))
        {
            return false;
        }
​
        string[] parts = email.Split('@');
        if (parts.Length != 2)
        {
            return false; // email must have exactly one @ symbol
        }

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