Simple app to take username and password from the user
Just a few things:


Don't use \n as a literal, we use Environment.NewLine instead.
Don't use "string concatenation" (string + string), instead use string.Join, string.Format or a StringBuilder. I.e.:


Console.WriteLine(option1 + "\n" + option2);



Should be:

Console.WriteLine("{0}{1}{2}", option1, Environment.NewLine, option2);


Just as well, you should, ideally, switch this to two Console.WriteLine statements:

Console.WriteLine(option1);
Console.WriteLine(option2);

A method should have on responsibility (SRP):

public static bool Login(string username, string password)
{
    if(username == "asd" &amp;&amp; password == "asd")
    {
        Console.WriteLine("Welcome");
        return true;
    }
    else
    {
        return false;
    }
}


The Console.WriteLine statement does not belong there, Login should simply return true or false in this case.