How to read the data dynamically from mongoDb by passing custom dates and batch size

Working with Data Drivers
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1 
var collection = _client.GetDatabase(_settings.MongoDatabaseName).GetCollection<BsonDocument>(mongoCollection);
var documents = collection.Find(doc => true).Limit(batchSize).ToList();

// I am able to pass the batch size but not sure how to pass the custom dates . this line should be work with multiple collections

2

Could you please provide simple input data, and the corresponding desired output?