Got to this point but now have an error I can't unravel.
I have compared my code to the supplied and it's the same - but no go. When I click the link I get this URL, and this error:

http://localhost:1447/Websites/BegAs...stName=Davolio

(I include the above URL b/c I can get to the rest of the pages at that path, so the path itself is fine).

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: BC30545: Property access must assign to the property or use its value.

Source Error:
Line 16: <h2>
Line 17: Details for Employee
Line 18: <% Request.QueryString("ID")%> :
Line 19: <% Request.QueryString("FirstName")%>
Line 20: <% Request.QueryString("LastName")%>
Source File: C:\Websites\BegAspNet2Db\ch05\TIO-0503-HyperlinkTarget.aspx Line: 18

<% should be <%= in your code.