using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

[Serializable]

public class Cart :System.Collections.Generic.List<ProductItem>

{

public void Remove(int productId)

      {

ProductItem item = this.FindItemByProductId(productId);

if(item!=null)

                  {

base.Remove(item);

                  }

      }

public ProductItem FindItemByProductId(int ProductId)

      {

foreach (ProductItem item in this)

            {

if (item.ProductID.Equals(ProductId))

                  {

return item;

                  }

            }

return null;

      }

}