public static bool TryRemove(RelationProjectEmployee toRemove)
 {
     if (GetEmployeesOnProject(toRemove.NameOfProject).Count == 1)
     {
         return(false);
     }
     AllRelations.Remove(toRemove);
     return(true);
 }
        public static bool TryAdd(string nameOfProject, string oib, int hoursOfWork)
        {
            foreach (var relation in AllRelations)
            {
                if (relation.NameOfProject == nameOfProject && relation.Oib == oib)
                {
                    return(false);
                }
            }

            var newRelation = new RelationProjectEmployee(nameOfProject, oib, hoursOfWork);

            AllRelations.Add(newRelation);
            return(true);
        }
 public static void Remove(RelationProjectEmployee toRemove)
 {
     AllRelations.Remove(toRemove);
 }