Bill,

>How would I then capture the PK when I enter the Edit Form, from the string passed with the URL?

Check out the Web Forms Jump Start in the MM .NET DevGuide...in "Step 11: Registering Business Object on the Order Edit Form" you'll see that you can grab a variable from the url using the ASP.NET Request.QueryString["variable name"]:

// Retrieve the Order ID passed by the Customer Orders page 
// from the query string variable
int OrderID = int.Parse(Request.QueryString["orderID"]);

Regards,