An example of querying Master resources in Azure DocumentDB

QueryMasterResources.cs

// Check if database exists, if not create it
 Database database = client.CreateDatabaseQuery().Where(db => db.Id == id).ToArray().FirstOrDefault();
 if (database == null)
 {
    database = await client.CreateDatabaseAsync(new Database { Id = id });
 }

 // Get collection 
 StudentsCollection = client.CreateDocumentCollectionQuery(database.SelfLink).Where(c => c.Id == collectionId).ToArray().FirstOrDefault();