Inserting json file to mongodb

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JSON

MongoDB

Hi,
I want to insert a JSON file but it's showing that duplicate _id cannot be inserted in MongoDB . I have json input file in below format
{"Name":"Name1","age": 21,..................}
{"Name":"Name1","age": 21,..................}
can any one help ?

What I have tried:

<pre> var client = new MongoClient();
                IMongoDatabase db = client.GetDatabase("TestDB1");
                string text = System.IO.File.ReadAllText(@"D:\DataMorph\Check.json");
                //var document = BsonSerializer.Deserialize<BsonDocument>(text);
                //var collection = db.GetCollection<BsonDocument>(collectionName);
                BsonDocument document = MongoDB.Bson.Serialization.BsonSerializer.Deserialize<BsonDocument>(text);
                var collection = db.GetCollection<BsonDocument>("data");               
                collection.InsertOne(document);