Javascript array sending to asp.net MVC controller

There's essentially 2 ways you can get that data back to the server:

1. You can put the data into a form element and post that form to an action that's set up to receive it. This will require you to put your username, password, etc into a series of html elements with name attributes set up to follow MVC's conventions (This page has some information on the conventions to use).

2. You can use jQuery's ajax features to send a raw javascript object containing your data to an MVC action (See this answer and it's linked post for details on how to accomplish this).

In either case, you probably shouldn't be sending a username & password to the server with every request, as you can use an authentication cookie to verify a user's identity once they're logged in to your application (there's plenty of resources online explaining how this works).

For option 2:

Javascript:

var myobject = {
    username: "Joe",
    password: "password",
    points: [{ x: 111.1112, y: 22.2222 },{ x: 11.12, y: 21.11 }]
}

jQuery.ajax({
    url: "/MyController/MyAction",
    contentType: "application/json",
    dataType: "json",
    data: JSON.stringify(myobject)
})

C#:

public class PointModel 
{
    public double x { get; set; }
    public double y { get; set; }
}

public class MyModel
{
    public string username { get; set; }
    public string password { get; set; }
    public IList<PointModel> points { get; set; }
}

public class MyController : Controller 
{
    [HttpPost]
    public JsonResult MyAction(MyModel model) {
        ...
    }
}