using System;
using System.Linq;


public class Range
{
    public int Start { get; set; }
    public int End { get; set; }

}

public class Item
{
    public int Number { get; set; }
}


public class Test
{
	
	public static void Main()
	{
			
		var ranges = new Range[]
		{
		    new Range{Start = 1, End = 5},
		    new Range{Start = 6, End = 10}
		};
	
		var items = new Item[]
		{
		    new Item{Number = 3},
		    new Item{Number = 4},
		    new Item{Number = 7},
		    new Item{Number = 9}
		};
		
		var rangeGroups = ranges
			.Select(r=> new {Range=r, Items=items.Where(i=> (r.Start <= i.Number) && (i.Number <= r.End))});
			
		foreach(var rangeGroup in rangeGroups)
		{
			Console.WriteLine("Start: {0} End:{1}",rangeGroup.Range.Start, rangeGroup.Range.End );
			
			foreach(Item item in rangeGroup.Items)
			{
				Console.WriteLine("\tItem: {0}",item.Number);
			}
		}
	
	}
}