How to retrieve the list of printers installed on the server

 Hi, all
 I meet an urgent problem which is 

My asp.net app tries to
retrive the list of printers installed on the server. 1. I use impersonation <identity impersonate="true" userName="a_user_name" password="the_pass_word"/>2. I created the user account3. I log in the server under the account and add a
network printer However my app can't find the printer. My code is using System.Drawing.Printing.PrinterSettings.InstalledPrinters. What I like to know just the list of names of the printer installed. Appreciate your help very ...