Database collections created by the c# driver do not prepend the "<dbname>." to the collection name
Example:
/* Prerequisite: testdb does not exist */
Mongo mongo = new Mongo();
mongo.Connect();
Database db = mongo["testdb"];
db["testcollection"].Insert(new

);

-> Expected: the created collection name is "testdb.testcollection"
-> Observed: the created collection name is "testcollection"

OBS: Verified with the mongo.exe command-line tool