internal static bool UpdateStudent(Student ChangedStudent)
        {
            try
            {
                context.SaveChanges();

                return(true);
            }
            catch (Exception exc)
            {
                return(false);
            }
        }
        internal static bool RemoveStudents(List <int> SelectedStudentsId)
        {
            try
            {
                foreach (var id in SelectedStudentsId)
                {
                    var delStudent = new Student()
                    {
                        IdStudent = id
                    };

                    context.Students.Attach(delStudent);
                    context.Students.Remove(delStudent);

                    context.SaveChanges();
                }

                return(true);
            }
            catch (Exception exc)
            {
                return(false);
            }
        }
        internal static void AddStudent(Student newStudent)
        {
            context.Students.Add(newStudent);

            context.SaveChanges();
        }