Why doesn't my ChannelFactory see my endpoint configuration?

public AdminClient()
{
    ChannelFactory<IProductAdmin> factory = new ChannelFactory<IProductAdmin>();
    productAdminChannel = factory.CreateChannel();
}

<system.serviceModel>
    <client>
    	<endpoint address="net.tcp://localhost:8002/ProductBrowser"
    			  binding="netTcpBinding"
    			  contract="Contracts.IProductAdmin" />
    </client>
</system.serviceModel>

public AdminClient()
{
    var fac = new ChannelFactory<IProductAdmin>("admin");
    productAdminChannel = fac.CreateChannel();
}

<system.serviceModel>
    <client>
    	<endpoint name="admin"
    			  address="net.tcp://localhost:8002/ProductBrowser"
    			  binding="netTcpBinding"
    			  contract="Contracts.IProductAdmin" />
    </client>
</system.serviceModel>

public AdminClient()
{
    ChannelFactory<IProductAdmin> factory
         = new ChannelFactory<IProductAdmin>("*");

    productAdminChannel = factory.CreateChannel();
}

using System;
   using System.ServiceModel;

   namespace CoDeMagazine.ServiceArticle
   {
       public class ProductClient
          : ClientBase<IProductBrowser>,
            IProductBrowser
       {

           #region IProductBrowser Members

           public ProductData GetProduct(
              Guid productID)
           {
               return Channel.GetProduct(productID);
           }

           public ProductData[] GetAllProducts()
           {
               return Channel.GetAllProducts();
           }

           public ProductData[] FindProducts(
              string productNameWildcard)
           {
               return Channel.FindProducts(
                  productNameWildcard);
           }

           #endregion
       }

   }

public AdminClient()
    {
        ChannelFactory<IProductAdmin> factory =
           new ChannelFactory<IProductAdmin>(string.Empty);
        productAdminChannel = factory.CreateChannel();
    }