private void cboCategory_SelectionChangeCommitted(object sender, EventArgs e)
{
AlmacenDisecWS.category c = (AlmacenDisecWS.category)cboCategory.SelectedItem;
cboFamily.DataSource = serviceDA.queryFamilyByCategory(c.category_id, 2);
cboFamily.DisplayMember = "name_family";
cboFamily.ValueMember = "id_family";
}