Group.cs

namespace Base
{
    class Group
    {
        public List<Student> Grop;
        public int numgroup, course;
        public Group(List<Student> som)
        {
            Grop = som;
        }
        public void Add(Student a)
        {
            Grop.Add(a);
        }
        public void Del(string z)
        {
            int c = 0;
            foreach (Student n in Grop)
            {
                bool res = true;
                if (n.name.Length == z.Length)
                {
                    for(int i = 0; i <z.Length; i++)
                    {
                        if (n.name[i] != z[i])
                        {
                            res = false;
                        }
                    }
                }
                else
                {
                    res = false;
                }
                if (res)
                {
                    Grop.RemoveAt(c);
                    c--;
                }
                c++;
            }
        }

        public void showgroup()
        {
            Console.WriteLine("Number of group: {0}. Course: {1}. Size of group: {3}", numgroup, course, Grop.Count());
        }

        public void showstudents()
        {
            Console.WriteLine("Student of {0} group: ", numgroup);
            foreach(Student a in Grop)
            {
                Console.WriteLine("Student {0} {1}, Stud ticket is {2}", a.name, a.surname, a.stnum);
            }
        }
    };
}