Check out example codes for "c# how to get ram usage on system". It will help you in understanding the concepts better.

Code Example 1

ObjectQuery wql = new ObjectQuery("SELECT * FROM Win32_OperatingSystem");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(wql);
ManagementObjectCollection results = searcher.Get();

foreach (ManagementObject result in results)
    Console.WriteLine("Total Visible Memory: {0} KB", result["TotalVisibleMemorySize"]);
    Console.WriteLine("Free Physical Memory: {0} KB", result["FreePhysicalMemory"]);
    Console.WriteLine("Total Virtual Memory: {0} KB", result["TotalVirtualMemorySize"]);
    Console.WriteLine("Free Virtual Memory: {0} KB", result["FreeVirtualMemory"]);

/* Outputs:
    Total Visible Memory: 25054184 KB
    Free Physical Memory: 17048656 KB
    Total Virtual Memory: 29117416 KB
    Free Virtual Memory: 18637080 KB

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