public override bool Equals(object obj)
{
Student another = (Student)obj;
return(LastName.ToLower().Equals(another.LastName.ToLower()) &&
FirstName.ToLower().Equals(another.FirstName.ToLower()) &&
Patronymic.ToLower().Equals(another.Patronymic.ToLower()) &&
BirthDate.Equals(another.BirthDate) &&
EnterDate.Equals(another.EnterDate) &&
Char.ToLower(GroupIndex).Equals(Char.ToLower(another.GroupIndex)) &&
Faculty.ToLower().Equals(another.Faculty.ToLower()) &&
Specialization.ToLower().Equals(another.Specialization.ToLower()) &&
Performance == another.Performance);
}