This in particular:
Wrox.WebModules.Accounts.ProcResultCodes.AccountAlreadyOnFile;

When I try to recreate the code from the book....I get build errors for the
ProcResultCodes  [The type or namespace name 'ProcResultCodes' does not
exist in the class or namespace 'CFM.WebModules.Accounts' (are you missing
an assembly reference?)]

Here's the code it is in (from Modules\Accounts\ACCOUNTSDATA\User.cs):

			try 
			{
				RunProcedure("sp_Accounts_CreateUser",
parameters, out rowsAffected);
			}
			catch ( SqlException e )
			{
				// 2601 is the number returned when the
primary key
				// is violated. We know if we're violating
the primary
				// key that the e-mail address is already on
file.
				// Its cheaper than actually searching for
that address before
				// inserting.
				if (e.Number == 2601) 
				{
					return
(int)Wrox.WebModules.Accounts.ProcResultCodes.AccountAlreadyOnFile;
				}
				else 
				{
					throw new AppException("An error
occurred while executing the Accounts_CreateUser stored procedure",
						e );
				}
			}