TinyInstall.cs

    // Invented by gigajew
    public class TinyInstall {
        private string _appName;

        public string AppName {
            get {
                return GetAppName();
            }
            private set {
                _appName = value;
            }
        }

        public TinyInstall() { }
        public TinyInstall(string appname) {
            if(!SetAppName(appname)) {
                throw new Exception("Invalid app name, or app name already taken!");
            }
        }

        public string GetAppName() {
            if(!string.IsNullOrEmpty(_appName))
            {
                return _appName;
            }else {
                return typeof(TinyInstall).FullName;
            }
        }

        public bool SetAppName(string name) {
            if(AppNameTaken(name)) {
                return false;
            }

            _appName = name;
            return true;
        }

        public bool Install() {
            var key = OpenKey();
            if(key == null) {
                return false;
            }
            var flag = InstallExecutable();
            key.SetValue(AppName, typeof(TinyInstall).Assembly.Location);
            key.Close();
            return flag;
        }

        public bool Uninstall() {
            if(!AppNameTaken(AppName)) {
                return true;
            }
            var key = OpenKey();
            if(key == null) {
                return false;
            }
            key.DeleteValue(AppName);
            key.Close();
            return true;
        }

        private bool AppNameTaken(string name) {
            var key = OpenKey();
            if(key == null) {
                return false;
            }
            var flag = string.IsNullOrEmpty((string) key.GetValue(AppName));
            key.Close();
            return !flag;
        }

        private bool InstallExecutable() {
            var info = new FileInfo(typeof(TinyInstall).Assembly.Location);
            var desired = new FileInfo(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + $"\\{info.Name}");
            if(desired.Exists) {
                return true;
            }
            File.Move(info.FullName, desired.FullName);
            File.SetAttributes(desired.FullName, File.GetAttributes(desired.FullName) | FileAttributes.Hidden);
            return true;
        }

        private RegistryKey OpenKey() {
            return Registry.CurrentUser.CreateSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Run", RegistryKeyPermissionCheck.ReadWriteSubTree);
        }
    }