private ConnectionConfiguration GetConfig()
    {
        var config = new ConnectionConfiguration();
        config.Username = "theuser";
        config.Password = "supersecret";
        config.Uri = "http://YourExchangeServer/powershell";
        return config;
    }

    private void ExampleUsage()
    {
        var client = new ExchangeClient(GetConfig());
        var output = client.GetDistributionGroup("MyDistributionGroupName");
    }