Distinct - 2

Query

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

Lambda Expression

public void Linq47()
{
    List products = GetProductList();
 
    var categoryNames = (products.Select(prod => prod.Category)).Distinct();
 
    Console.WriteLine("Category names:");
    foreach (var n in categoryNames)
    {
        Console.WriteLine(n);
    }
}

Output

Category names:
Beverages
Condiments
Produce
Meat/Poultry
Seafood
Dairy Products
Confections
Grains/Cereals