System.Tools.ResGen.GetFormat C# (CSharp) Method

        private static Format GetFormat(string filename) {
            string extension = Path.GetExtension(filename);
            if (String.Compare(extension, ".txt", true, CultureInfo.InvariantCulture) == 0 ||
                String.Compare(extension, ".restext", true, CultureInfo.InvariantCulture) == 0)
                return Format.Text;
            else if (String.Compare(extension, ".resources", true, CultureInfo.InvariantCulture) == 0)
                return Format.Binary;
            else {
                Error(SR.GetString(SR.UnknownFileExtension, extension, filename));
                Environment.Exit(errorCode);
                return Format.Text; // never reached
            }
        }