I am trying to change a join to LEFT outer join but getting all sorts of conversion errors. Below is my current join, can anybody provide any suggestion on how to do this without changing the actual logic of this join?

```
 BRAND_NAME_MAP_MASTER objBrandNameMap = DB.PFC_MAP_MASTERs.Join(
          DB.BRAND_NAME_MAPs,
          a => a.BRAND_NAME_MAP_ID, b => b.BRAND_NAME_MAP_ID,
    (a, b) => new { a, b }).Where(x => x.a.BRAND_NAME_MAP_ID == BrandNameMapID && 
        x.b.BRAND_NAME_MAP_ID == BrandNameMapID).Select(x => x.a).FirstOrDefault();

```