public void Remove(ICommissionConcern concern)
 {
     if (concern == null)
     {
         throw new ArgumentNullException("concern");
     }
     Commission.Remove(concern);
 }
 public void AddFirst(ICommissionConcern concern)
 {
     if (concern == null)
     {
         throw new ArgumentNullException("concern");
     }
     Commission.Insert(0, concern);
 }
 public void Add(ICommissionConcern concern)
 {
     if (concern == null)
     {
         throw new ArgumentNullException(nameof(concern));
     }
     Commission.Add(concern);
 }
		public void AddFirst(ICommissionConcern concern)
		{
			if (concern == null)
			{
				throw new ArgumentNullException("concern");
			}
			Commission.Insert(0, concern);
		}
		public void Add(ICommissionConcern concern)
		{
			if (concern == null)
			{
				throw new ArgumentNullException("concern");
			}
			Commission.Add(concern);
		}