Cache GetQueryService Method Pivotal GemFire .NET Client Documentation
Get a query service object to be able to query the cache. Supported only when cache is created from Pool(pool is in multiuserSecure mode)

Namespace: GemStone.GemFire.Cache
Assembly: GemStone.GemFire.Cache (in GemStone.GemFire.Cache.dll) Version:

public QueryService GetQueryService()

Currently only works against the java server in native mode, and at least some endpoints must have been defined in some regions before actually firing a query.
See Also