Monitor.GetResolutionType1 Method

public static string GetResolutionType1()
 {
     uint width = 0;
     uint height = 0;
     foreach (var desktopMonitor in new ManagementObjectSearcher("ROOT\\CIMV2",
         "SELECT * FROM Win32_DesktopMonitor").Get())
     {
         width = (uint)desktopMonitor["ScreenWidth"];
         height = (uint)desktopMonitor["ScreenHeight"];
     }
     return $"{Convert.ToString(width)}x{Convert.ToString(height)}";
 }