c# - System.FormatException' occurred in MongoDB.Bson.dll - XXX is not a valid 24 digit hex string -

i have created c# class this:

 public class employee     {         [bsonrepresentation(bsontype.objectid)]         public string name { get; set; }         public int age { get; set; }         public list<string> address { get; set; }     } 

when try save information (using mongodb) this:

   var e = new employee();     e.address = new list<string>();     e.address.add("address 1");     e.address.add("address 2");      e.age = 333;     e.name = "some name";     context.employees.insert(e); 

i getting following error:

an unhandled exception of type 'system.formatexception' occurred in mongodb.bson.dll  additional information: 'some name' not valid 24 digit hex string. 

how can make string field act objectid in mongodb?

reading docs:

... in case serializer convert objectid string when reading data database , convert string objectid when writing data database (the string value must valid objectid) ....

please remove white space string. should work!

to proof wether have valid objectid, read following so-post: mongodb node check if objectid valid

edit: final answer was: you have change [bsonrepresentation(bsontype.objectid)] [bsonid]