C# WMI memory usage

get_mem.cs

// @yasinkuyu
// 06/05/2014
 
public dynamic get_mem()
{
    dynamic returndata = new ExpandoObject();
 
    var search = new ManagementObjectSearcher("root\\CIMV2", "Select TotalVisibleMemorySize, FreePhysicalMemory from Win32_OPeratingSystem");
 
    foreach (var x in search.Get())
    {
 
        var totalMemory = (ulong)x["TotalVisibleMemorySize"];
        var freeMemory = (ulong)x["FreePhysicalMemory"];
 
        // -> KB to MB
        var totalmem = (double)totalMemory / 1024; ;
        var freemem = Convert.ToInt32(Math.Round(Convert.ToDecimal((((double)freeMemory / 1024)))));
        var usedmem = Convert.ToInt32(Math.Round(Convert.ToDecimal((((totalmem - freemem))))));
 
        // Multiple return object
        returndata.total = totalmem;
        returndata.usage = usedmem;
        returndata.free = freemem;
    }
 
    return returndata;
}

Sample
var memUsage = get_mem.usage;

Output
4726