Get Maximum Screen Size Primary in WPF

  public Size GetMaximumScreenSizePrimary()
        {
            var scope = new System.Management.ManagementScope();
            var q = new System.Management.ObjectQuery("SELECT * FROM CIM_VideoControllerResolution");
            UInt32 maxHResolution = 0;
            UInt32 maxVResolution = 0;

            using (var searcher = new System.Management.ManagementObjectSearcher(scope, q))
            {
                var results = searcher.Get();
             
                foreach (var item in results)
                {
                    if ((UInt32)item["HorizontalResolution"] > maxHResolution)
                        maxHResolution = (UInt32)item["HorizontalResolution"];

                    if ((UInt32)item["VerticalResolution"] > maxVResolution)
                        maxVResolution = (UInt32)item["VerticalResolution"];
                }
               
            }
            return new Size(maxHResolution, maxVResolution);
        }