Select datatable with join return 0

Good night,

I have one DataTeble that execute this slq query in my access database in c#:

DataTable dtCdDvd = cls.Fun_RetornaDataTable("SELECT tblCdDvd.Cod, tblCdDvd.Nome, tblCdDvd.Tamanho, tblTipo.Tipo, tblCdDvd.Grupo FROM [tblCdDvd] INNER JOIN [tblTipo] ON tblCdDvd.Tipo=tblTipo.Cod WHERE Status = TRUE");

if i use DataRow[] result = dtCdDvd.Select("[Grupo]=0"); the result is 0 rows and exist registry with informed code.

The more interesting is if my sql query runs "SELECT Grupo FROM tblGrupo" without join table my result is different of 0.