using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var Items = new [] {

            new { Name = "Item1", Type = 1 },

            new { Name = "Item2", Type = 1 },

            new { Name = "Item3", Type = 2 },

            new { Name = "Item4", Type = 2 }

        };

        var gItems = Items.GroupBy(item => item.Type, item => item.Name);

        foreach(var gItem in gItems) {

           Console.WriteLine(gItem.Key);

            foreach(var item in gItem) {

                Console.WriteLine(item);

            }

        }

    }

}

​

​

​