Form post from partial view to API - ajax

Question

I am trying to create an SPA application using Sammy. When I call #/entitycreate link, I return a partial view from Home controller which contains an html form to submit. Partial view comes as I expect but rest of it doesn't work. Below are my problems and questions, I'd appreciate for any help.
KO binding doesn't work in partial view, even though I did exactly how it's done in the default SPA project template (see home.viewmodel.js).
This one is the most critical: when I submit this form to my API with ajax/post, my model always comes back with a null value, therefore I can't create an entity via my API. I have tried with [FromBody] and without, model always comes null.
In some sense a general question, should I include Html.AntiForgeryToken() in my form and [ValidateAntiForgeryToken] attribute in my API action?
Partial View:
#model namespace.SectorViewModel
<!-- ko with: sectorcreate -->
<div class="six wide column">
<div class="ui segments">
<div class="ui segment">
<h4 class="ui center aligned header">Create New Sector</h4>
</div>
<div class="ui secondary segment">
<form id="entity-create-form" class="ui form" action="#/sectorcreatepost" method="post" data-bind="submit: createEntity">
<!-- I am not sure if I should include AntiForgeryToken for WebAPI call -->
<!-- Html.AntiForgeryToken() -->
<fieldset>
<div class="field required">
#Html.LabelFor(m => m.Name)
#Html.TextBoxFor(m => m.Name, new { data_bind = "value: name" })
</div>
<div class="ui two buttons">
<button class="ui positive button" type="submit">Create</button>
<button class="ui button" type="button" id="operation-cancel">Cancel</button>
</div>
</fieldset>
</form>
</div>
</div>
</div>
<!-- /ko -->
JS View Model:
function SectorCreateViewModel(app, dataModel) {
var self = this;
self.name = ko.observable("ko binding doesn't work");
self.createEntity = function () {
console.log("ko binding doesn't work");
}
Sammy(function () {
this.get("#sectorcreateget", function () {
$.ajax({
url: "/home/getview",
type: "get",
data: { viewName: "sectorcreate" },
success: function (view) {
$("#main").html(view);
}
});
return false;
});
this.post("#/sectorcreatepost",
function () {
$.ajax({
url: "/api/sectors",
type: "post",
data: $("#entity-create-form").serialize(),
contentType: "application/json; charset=utf-8",
success: function (response) {
console.log(response);
},
error: function (xhr, status, error) {
console.log(xhr);
console.log(status);
}
});
return false;
});
this.get("#/yeni-sektor", function () {
this.app.runRoute("get", "#sectorcreateget");
});
});
return self;
}
app.addViewModel({
name: "SectorCreate",
bindingMemberName: "sectorcreate",
factory: SectorCreateViewModel
});
API Action:
public HttpResponseMessage Post([FromBody]SectorViewModel model)
{
// model is always null, with or without [FromBody]
if (!ModelState.IsValid)
return Request.CreateResponse(HttpStatusCode.BadRequest);
// repository operations...
return response;
}

Answer 1

I have removed contentType: "application/json; charset=utf-8", from ajax request based on the article here. #2 is now resolved, #1 and #3 still remains to be answered.