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You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. 
The application allows users to post comments to a page that can be viewed by other users. 
You add a SqlDataSource control named SqlDS1. You write the following code segment. （Line numbers are included for reference only.） 
01 private void SaveComment（） 
02 { 
03 string ipaddr； 
04 
05 SqlDS1.InsertParameters["IPAddress"].DefaultValue = ipaddr； 
06 ... 
07 SqlDS1.Insert（）； 
08 } 
You need to ensure that the IP Address of each user who posts a comment is captured along with the user’s comment. 
Which code segment should you insert at line 04？（）

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. 
All the content pages in the application use a single master page. The master page uses a static navigation menu to browse the site. 
You need to ensure that the content pages can optionally replace the static navigation menu with their own menu controls. What should you do？ （）