Linq to get Duplicate Values from a list

void Main()

{

       //int[] listOfItems = new[] { 4, 2, 3, 1, 6, 4, 3 };

       List<Hotel> listOfItems = new List<Hotel>();

       listOfItems.Add(new Hotel(){ name="Hotel1"});

       listOfItems.Add(new Hotel(){ name="Hotel2"});

       listOfItems.Add(new Hotel(){ name="Hotel3"});

       listOfItems.Add(new Hotel(){ name="Hotel3"});

       listOfItems.Add(new Hotel(){ name="Hotel4"});

       listOfItems.Add(new Hotel(){ name="Hotel1"});

       listOfItems.Add(new Hotel(){ name="Hotel4"});

      

       var duplicates = listOfItems

           .GroupBy(i => i.name)

           .Where(g => g.Count() > 1)

           .Select(k => k.Key);

      

       Console.WriteLine(duplicates.Count());

      

       foreach (var d in duplicates)

           Console.WriteLine(d);

}

class Hotel

{

public string name;

}