I wrote these lines in My Application start event:

    var mongo = new Mongo();
    mongo.Connect();
    var blog = mongo.GetDatabase("Blog");
    mongo.Disconnect();

but on this line: mongo.Connect(); it gave me this error:

No connection could be made because the target machine actively refused it 127.0.0.1:27017

I am a beginner using Mongodb and i am just try to make sample code to see it's power.
So i have no idea how to solve this problem.

I am using VS2008 with MongoDB.Driver on Windows7.