UserRepository.cs

/// <summary>
/// Class used to access Mongo DB.
/// </summary>
public class UsersRepository
{
    private IMongoClient _client;
    private IMongoDatabase _database;
    private IMongoCollection<User> _usersCollection;

    public UsersRepository(string connectionString)
    {
        _client = new MongoClient(connectionString);
        _database = _client.GetDatabase("blog");
        _usersCollection = _database.GetCollection<User>("users");
    }
}