ki | compiler based on the super tiny compiler | Natural Language Processing library

namespace test
{
    class Program
    {

        class Table
        {
            public int NubmerOfChairs { get; set; }
            public List ListOfGuests { get; set; }

            public Table(int ChairNum)
            {
                this.NubmerOfChairs = ChairNum;
                this.ListOfGuests = new List(ChairNum);
            }
        }

        class Gost {

            public string name;
            public string secname;
            public string gender;
            public string status;
            public  string bd;
            public  string gmail;

            public Gost(string name, string secname, string gender, string status, string bd, string gmail)
            {
                this.name = name;
                this.secname = secname;
                this.gender = gender;
                this.status = status;
                this.bd = bd;
                this.gmail = gmail;        
            }
        
        }
        static void Main(string[] args)
        {
            //MizaPolnaException, ki se proži ob poskusu dodajanja gosta na že zapolnjeno mizo.
            Table polnaMiza = new Table(2);
            try
            {
                Gost novGost = new Gost("Jack1", "black1", "M", "student", "22.2.1966", "testxxx@gmail.com");
                Gost novGost2 = new Gost("Jack2", "black2", "M", "student", "22.2.1966", "testxxx@gmail.com");
                Gost novGost3 = new Gost("Jack3", "black3", "M", "student", "22.2.1966", "testxxx@gmail.com");

                polnaMiza.ListOfGuests.Add(novGost);
                polnaMiza.ListOfGuests.Add(novGost2);
                polnaMiza.ListOfGuests.Add(novGost3);
            }
            catch (Exception e)
            {
                throw new TableFull("No chairs left");
            }
        }
    }
}

I want it to throw an error when I add a third guest because my list is only 2 elements long can someone please help me I am new to c#. I added my list length by ChairNum I've read on stack overflow by putting in int you set the max value of list