DeleteManyAsync is used in .Net 4.5 and later versions for deleting one or
more number of records in MongoDB by using C# driver 2.0, we should add MongoDB
reference for the working solution.
Find the example below, Deleting
Multiple data from MongoDB document with the records having 'MasterID' less than 1000
var results = await
collection.DeleteManyAsync(
Builders<BsonDocument>.Filter.Lt("MasterID", 1000));