AEMManager.IconCache.GetIcon_Interal C# (CSharp) Method

        private static Icon GetIcon_Interal(IconSet pIconSet, string pCustomIconPath, string pState)
        {
            string iconSetName = pIconSet.ToString().ToLower();
              if (!string.IsNullOrEmpty(pCustomIconPath) && File.Exists(pCustomIconPath)) {
            if (iconSetName.StartsWith("inv_")) {
              iconSetName = "inv_overlay";
            }
            else {
              iconSetName = "overlay";
            }

            Icon icon = new Icon(pCustomIconPath);
            string overlayIconPath = "AEMManager.resources." + iconSetName + "." + pState + ".ico";
            Icon overlayIcon = new Icon(Assembly.GetExecutingAssembly().GetManifestResourceStream(overlayIconPath));

            return GetIcon_InternalWithOverlay(icon, overlayIcon);
              }
              else if (iconSetName != IconSet.DEFAULT.ToString().ToLower()) {
            string iconPath = "AEMManager.resources." + IconSet.DEFAULT.ToString().ToLower() + "." + pState + ".ico";
            Icon icon = new Icon(Assembly.GetExecutingAssembly().GetManifestResourceStream(iconPath));

            string overlayIconPath = "AEMManager.resources.iconset_" + iconSetName.Substring(0, iconSetName.Length - 1) + "." + iconSetName.Substring(iconSetName.Length - 1) + ".ico";
            Icon overlayIcon = new Icon(Assembly.GetExecutingAssembly().GetManifestResourceStream(overlayIconPath));

            return GetIcon_InternalWithOverlay(icon, overlayIcon);
              }
              else {
            string iconPath = "AEMManager.resources." + iconSetName + "." + pState + ".ico";
            return new Icon(Assembly.GetExecutingAssembly().GetManifestResourceStream(iconPath));
              }
        }