public void SaveRegister(string str_user)
   {
            Employee emp = new Employee();
           
            emp.EmpID= txtEmp.Text;
            emp.EmpNo = txtEmp.Text;
            emp.UserName = str_user;
            emp.DeviceID= "test";
            emp.IsActive = 0;
            emp.IsRegister = 1;

            App.EmpDB.SaveEmployeeAsync(emp);

    }