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单项选择题 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 SqlDS. You write the following code segment:   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 alongwith the user’s comment.  Which code segment should you insert at line 04?()

A、ipaddr = Server["REMOTE_ADDR"].ToString(); 

B、ipaddr = Session["REMOTE_ADDR"].ToString(); 

C、ipaddr = Application["REMOTE_ADDR"].ToString(); 

D、ipaddr = Request.ServerVariables["REMOTE_ADDR"].ToString();

  • D
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