example.cs

gistfile1.cs

public IEnumerable<int> Fibanocci() {
    var x1 = 1;
    var x2 = 1;

    while(true) {
       var x3 = x1 + x2;
       x1 = x2;
       x2 = x3;
       yield return x3;
    }
}

public static void Main() {
    var sequence = Fibanocci();

    foreach(var number in sequence.Take(5)) {
       Console.PrintLine(number.ToString());
    }

    foreach(var number in sequence.Take(5)) {
       Console.PrintLine(number.ToString());
    }
}