How to check connection to mongodb

To ping the server with the new 3.0 driver its:

var database = client.GetDatabase("YourDbHere");

database.RunCommandAsync((Command<BsonDocument>)"{ping:1}")
        .Wait();

There's a ping method for that:

var connectionString = "mongodb://localhost";
var client = new MongoClient(connectionString);
var server = client.GetServer();
server.Ping();