private async void Get(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                EmployeeDatabase employeeDatabase = new EmployeeDatabase();
                employeeList = employeeDatabase.GetItems();
                employeeDatabase.Close();
            });

            listView.ItemsSource = employeeList;
        }
        public EmployeeScreen()
        {
            InitializeComponent();

            EmployeeDatabase employeeDatabase = new EmployeeDatabase();

            employeeList = employeeDatabase.GetItems();
            employeeDatabase.Close();

            listView.ItemsSource = employeeList;
        }
        private async void Insert(object sender, EventArgs e)
        {
            await Task.Run(() =>
            {
                Employee employee     = new Employee();
                employee.EmployeeId   = RandomNumber();
                employee.EmployeeName = RandomString(8);

                EmployeeDatabase employeeDatabase = new EmployeeDatabase();
                employeeDatabase.InsertItem(employee);
                employeeDatabase.Close();
            });
        }
        private async void Delete(object sender, EventArgs e)
        {
            var b = (Button)sender;
            var t = (long)b.CommandParameter;

            await Task.Run(() =>
            {
                EmployeeDatabase employeeDatabase = new EmployeeDatabase();
                employeeDatabase.DeleteItem(t);
                employeeDatabase.Close();

                EmployeeDatabase employeeDatabase1 = new EmployeeDatabase();
                employeeList = employeeDatabase1.GetItems();
                employeeDatabase1.Close();
            });

            listView.ItemsSource = employeeList;
        }