private Usuario Find(string userName)
 {
     try
     {
         return(dapperRepository.GetDapperResult <Usuario>("SELECT Username, Password " +
                                                           "FROM dbo.Usuario " +
                                                           "WHERE Username = @Username", new { Username = userName }).FirstOrDefault());
     }
     catch (Exception ex)
     {
         return(null);
     }
 }