How to get Memory usage from WMI

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C#

.NET

WMI

Hey guys I am just wondering does anyone know how to get memory usage from a WMI command. I can get the CPU easily enough but struggling with the memory.

What I have so far

ManagementScope ms = new ManagementScope(@"\\" + server.Value + @"\root\cimv2");
SelectQuery sq = new SelectQuery("select * from Win32_PerfFormattedData_PerfOS_Processor");
ManagementObjectSearcher mos = new ManagementObjectSearcher(ms, sq);
   foreach (System.Management.ManagementObject mo in mos.Get())
   {
      var usage = mo["PercentProcessorTime"];
      Console.WriteLine(usage);
   }

Thanks guys