Getting a error while create a simple class

Question

namespace AccountOrganizer
{
  public class SetName
    {
        string[] MaleNames =
        {   "Jack",
            "Micheal",
            "Mike",
            "Jordan",
            "James",
            "William",
            "David",
            "Richard",
            "Charles",
            "Daniel",
            "Kevin",
            "Brian",
            "George",
            "Edward",
            "Ronald",
            "Jason",
            "Jeffrey",
        };

        List<string> MaleNameList = new List<string>(MaleNames);

        Random r = new Random();
        int Random = r.Next(0, MaleNameList.Count());

        string sethename = MaleNameList[Random];

    }
}

I get an error on line 25  28 and 30 i dont really understand why,
am i not allowed to create a list and a random object in a class?