// See https://aka.ms/new-console-template for more information
Console.WriteLine("Hello, World!");
// Type your username and press enter
Console.WriteLine("Enter username:");

// Create a string variable and get user input from the keyboard and store it in the variable


string? userName = "";

while(userName?.Length == 0)
{
    userName = Console.ReadLine();
    if(userName?.Length >= 1)
        {
            Console.WriteLine("Deiner Eingabe war: {0}", userName);
        }

    else 
        {
            Console.WriteLine("Keine Eingabe getätigt!");
        }
}