How can I create and consume a webservice that returns ArrayList

I cant figure this out... I am able to create the webservice, but I cannot consume it for the life of me!

I created my web service by following this guide: http://geekswithblogs.net/azamsharp/archive/2006/02/15/69658.aspx

When I try to consume it, I get this error every single time:
The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://tempuri.org/:GetProductsResponse. The InnerException message was 'Error in line 1 position 319. Element 'http://tempuri.org/:anyType' contains data of the 'http://tempuri.org/:ProductInfo' data contract. The deserializer has no knowledge of any type that maps to this contract. Add the type corresponding to 'ProductInfo' to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding it to the list of known types passed to DataContractSerializer.'.  Please see InnerException for more details.

This is my first attempt at creating a web service that returns an array list and its driving me mad!

This is what my webservice looks like:

[WebMethod]
        [System.Xml.Serialization.XmlInclude(typeof(ProductInfo))]
        public ArrayList GetProducts()
        {
            return new StoreCatalog.CatalogController().GetProducts();

        }

this is how I am trying to consume the service:
 private void btnTest_Click(object sender, EventArgs e)
        {
                DServer.DServiceSoapClient client = new DClient.DServer.DServiceSoapClient();
                DServer.ArrayOfAnyType products = client.GetProducts();
         }



I have also attached a copy of the xml that is being produced.

I have googled this but the responses are very cryptic to me and I dont understand them.  I dont understand my problem so I guess thats why ;)  

Please can someone show me how to return an ArrayList properly!!!  If I cant use ArrayList, what is another alternative to passing a list of objects.

THANKS EXPERTS!



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<?xml version="1.0" encoding="utf-8" ?> 
- <ArrayOfAnyType xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/">
- <anyType xsi:type="ProductInfo">
  <P_Name>Blah Blah Blah</P_Name> 
  <P_ID>148470</P_ID> 
  </anyType>
- <anyType xsi:type="ProductInfo">
  <P_Name>Blah Blah Blah2</P_Name> 
  <P_ID>148471</P_ID> 
  </anyType>
 </ArrayOfAnyType>