Distinct i Linq İçerisinde Kullanmak

public void Linq46()
{
    int[] factorsOf300 = { 2, 2, 3, 5, 5 };
 
    var uniqueFactors = factorsOf300.Distinct();
 
    Console.WriteLine("Prime factors of 300:");
    foreach (var f in uniqueFactors)
    {
        Console.WriteLine(f);
    }
}

public void Linq47()
{
    List<Product> products = GetProductList();
 
    var categoryNames = (
        from p in products
        select p.Category)
        .Distinct();
 
    Console.WriteLine("Category names:");
    foreach (var n in categoryNames)
    {
        Console.WriteLine(n);
    }
}

//ListSınıfı için Distinct
    public class DistinctBasvurular : IEqualityComparer<UcretliBasvurulari>
    {
        public bool Equals(UcretliBasvurulari x, UcretliBasvurulari y)
        {

            if (x == null || y == null)    //optional
                return false;

            else
                return x.Bolum == y.Bolum;

        }
        public int GetHashCode(UcretliBasvurulari basvuru)
        {
            return basvuru.Bolum.GetHashCode();
        }

    }

private List<UcretliBasvurulari> BolumBagla()
    {
        IEnumerable ie = ObjectDataSource1.Select();
        var sonuc = (from s in ie.Cast<UcretliBasvurulari>()
                     orderby s.Bolum descending
                     select s).Distinct(new DistinctBasvurular());
        return sonuc.ToList<UcretliBasvurulari>();
    }