Caml Query with Lookup field
<Query> <Where> <Eq> <FieldRef Name='Fruit' /> <Value Type='Lookup'>Grapes</Value> </Eq> </Where> </Query> <Query> <Where> <Eq> <FieldRef Name='Fruit' LookupId='TRUE' /> <Value Type='Lookup'>15</Value> </Eq> </Where> </Query>