Linq with custom base collection

abstract class BaseCollection<T> : List<T> { ... }

class PruductCollection : BaseCollection<Product> { ... }

var products = from p in HugeProductCollection
               where p.Vendor = currentVendor
               select p;
PruductCollection objVendorProducts = new PruductCollection();
objVendorProducts.AddRange(products);

public static class MyExtensions
{
     public static ProductCollection
                      ToProducts( this IEnumerable<Product> collection )
     {
          return new ProductCollection( collection );
     }
}


public class ProductCollection : BaseCollection<Product>
{
     ...

     public ProductCollection( IEnumerable<Product> collection )
              : base( collection )
     {
     }

     ...
 }


var products = (from p in HugeProductCollection
                where p.Vendor = currentVendor
                select p).ToProducts();

abstract class BaseCollection<T> : List<T>
{
    public BaseCollection(IEnumerable<T> collection)
        : base(collection)
    {
    }
}

class PruductCollection : BaseCollection<Product>
{
    public PruductCollection(IEnumerable<Product> collection)
        : base(collection)
    {
    }
}

var products = from p in HugeProductCollection
               where p.Vendor = currentVendor
               select p;
PruductCollection objVendorProducts = new PruductCollection(products);