I have been trying to integrate newsletter capabilities for a customer's web site, using Mailjet API.

Official Mailjet API v3 .NET Wrapper uses asynchronous functions in order to contact the service. I have a SurfaceController, that gets an Id and tries to retrieve a contact from the Mailjet service.

In order to use the retrieve method I used something like this:

    public class PageNewsletterFormController : RenderMvcController
{
    public override ActionResult Index(RenderModel model)
    {
        string ContactID = Request.QueryString["id"];
        ContactModel contact = new ContactModel(model.Content);

        string ContactID = Request.QueryString["id"];
        ContactModel contact = new ContactModel(model.Content);

        JArray result = null;

        MailjetClient client = new MailjetClient(WebConfigurationManager.AppSettings["apiKey"], 
            WebConfigurationManager.AppSettings["apiSecret"]) { Version = ApiVersion.V3_1 };

        MailjetRequest request = new MailjetRequest
        {
            Resource = Contact.Resource
        }
        .Filter(Contact.ContactsList, WebConfigurationManager.AppSettings["contactslist"])
        .Filter(Contact.ID, ContactID)
        .Filter(Contact.Limit, "50");

        MailjetResponse response = client.GetAsync(request).Result;

        return CurrentTemplate(contact);
    }

As soon as the code hits the GetAsync() method the page freezes.

I tried to do the same with something like this:

    public class PageNewsletterFormController : RenderMvcController
{
    public async Task<ActionResult> NewsletterForm(RenderModel model)
    {
        string ContactID = Request.QueryString["id"];
        ContactModel contact = new ContactModel(model.Content);

        JArray result = null;

        MailjetClient client = new MailjetClient(WebConfigurationManager.AppSettings["apiKey"], 
            WebConfigurationManager.AppSettings["apiSecret"]) { Version = ApiVersion.V3_1 };

        MailjetRequest request = new MailjetRequest
        {
            Resource = Contact.Resource
        }
        .Filter(Contact.ContactsList, WebConfigurationManager.AppSettings["contactslist"])
        .Filter(Contact.ID, ContactID)
        .Filter(Contact.Limit, "50");

        MailjetResponse response = client.GetAsync(request).Result;

        return CurrentTemplate(contact);
    }

It has the same problem - it freezes.

Is there someone that can offer any pointers?

Thanks, George J.