using MongoDB.Bson; using MongoDB.Bson.IO; BsonReader reader = new JsonReader("{\"name\":null}"); reader.ReadStartDocument(); if (reader.ReadBsonType() == BsonType.Null) { string fieldName = reader.ReadName(); reader.ReadNull(); // process null value } reader.ReadEndDocument();In this example, we are using the BsonReader class to read a JSON string that contains a null value for the field "name". We first read the start of the BSON document, then check if the current BSON type is null using the ReadBsonType method. If it is null, we then read the name of the field and its null value using the ReadName and ReadNull methods respectively. Library package: MongoDB.Bson.