public int Login(string id, string pass, int choose)
{
List <SqlParameter> paras = new List <SqlParameter>();
paras.Add(new SqlParameter("@id", id));
paras.Add(new SqlParameter("@pass", pass));
paras.Add(new SqlParameter("@LuaChon", choose));
paras.Add(new SqlParameter("@KetQua", SqlDbType.Int));
paras[3].Direction = ParameterDirection.Output;
return(dp.ExecLogin("DangNhap", CommandType.StoredProcedure, paras));
}