using MongoDB.Bson; // create a new BsonDocument BsonDocument doc = new BsonDocument(); // add some elements to the document doc.Add("name", "John Smith"); doc.Add("age", 30); // clear the document doc.Clear();In the example above, we create a new BsonDocument and add some elements to it using the Add() method. We then call the Clear() method to remove all the elements in the document. This method is part of the MongoDB.Driver.Core package library.