IEnumerable

Please read the code and answer question below:

class Program
    {
        static void Main(string[] args)
        {


            IEnumerable<int> myEnum = Data().Where(it => it < 5);

            string site = "http://msprogrammer.serviciipeweb.ro/";

            int[] arr = myEnum.ToArray();

            site +=" number is "+ myEnum.Count();
            site += " number is " + myEnum.Count();
            Console.WriteLine(site);

        }


        static IEnumerable<int> Data()
        {

            int i = 5;
            i++;

            yield return i;
            yield return (i+7);
        }
    }

How many times the breakpoint at

int i = 5;

will be hit ?

Why?

And if your answer is not 3,please look at https://youtu.be/1fy_T9TCPpc