c# does not recognize WMI class

hi guys,

i'm having trouble to run a testing code that i found on internet.

it involves using WMI to query localhost information
somehow, my vs2010 ultimate seems not recognize CLASS that suppose to  be in SYSTEM.MANAGEMENT

e.g   compiler gives error on ManagementClass  which is listed on msdn class directory.


im using win7x64 ultimate and VS2010 ultimate.

can someone please help?
thanks


using System;
using System.Linq;
using System.Text;
using System.Management;
using System.Management.Instrumentation;

namespace ConsoleApplication2
{
   
public class QueryInstances {
    public static int Main(string[] args) {
      // create management class object
ManagementClass mc = new ManagementClass("Win32_ComputerSystem");
//collection to store all management objects
ManagementObjectCollection moc = mc.GetInstances();
if(moc.Count != 0)
{
    foreach (ManagementObject mo in mc.GetInstances())
    {
        // display general system information
        Console.WriteLine("\nMachine Make: {0}\nMachine Model: {1}\nSystem Type: {2}\nHost Name: {3}\nLogon User Name: {4}\n",
                          mo["Manufacturer"].ToString(),
                          mo["Model"].ToString(),
                          mo["SystemType"].ToString(),
                          mo["DNSHostName"].ToString(),
                          mo["UserName"].ToString());
    }
}
//wait for user action
Console.ReadLine();

      }
    
    }
}
    }

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IkelcaAsked:
Who is Participating?
 
Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
Adding "using System.Management" just includes the namespace into the current file. The System.Management namespace covers classes in a couple of different assemblies. Some of the classes in the namespace get included by default, whereas some of the additional classes require an extra assembly reference.
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Carl TawnSystems and Integration DeveloperCommented:
You need to add a reference to the "System.Management" assembly if you haven't already. Right-click your project choose "Add Reference". In the dialog that opens switch to the .Net tab and scroll down until you find "System.Management". Select it and click OK.
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IkelcaAuthor Commented:
great, that works, but how come "using System.Management;" does not work??
so i guess it's different from java?
then how do i know when to add reference?
0
 
IkelcaAuthor Commented:
i meant i thought adding "using System.Management" invoke class already...
0
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