This issue has been posted on StackOverflow : http://stackoverflow.com/questions/23093702/mongodb-c-sharp-with-driver-1-9-serialization-limited-number-of-parameters/23110359#23110359

The problem is that with .NET 3.5, I am not able to use custom BsonConstructor with more than 4 parameters, whereas if I use .NET 4.0 the issue is not here. I search a long time a workaround for this issue, and I dont have any idea of what causes this.