عمل لوب

	// say we have class Room like this
	public class Room
	{
		double value;

		public double Value
		{
			get { return this.value; }
			set { this.value = value; }
		}
		bool isValueAdded;

		public bool IsValueAdded
		{
			get { return isValueAdded; }
			set { isValueAdded = value; }
		}

		//get data(rooms) where date = now
		System.Collections.Generic.List<Room> rooms = new System.Collections.Generic.List<Room>();
		// populate rooms list
		// ......

		// check rooms
		foreach (Room room in rooms)
		{
			if (room.IsValueAdded) continue;
			room.Value += 2d;
			room.IsValueAdded = true;
		}