Need Help constructing LinqtoSQL Helper Class

Hi,

I'm a newbie and need some help constructing a LinqtoSQL helper class. I'm following the ScottGu blog/pdf page 90...but it's not working for me.

http://it-box.blogturk.net/wp-content/themes/it-box/files/LINQToSql.pdf

 

I am unable to see the data context references no doubt because I am doing something wrong? Can someone tell me how to construct a helper method for LINQToSQL?  

 

namespace Orders
{
public partial class OrderDataContext

{
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