Orchard CMS - Content Part (Editing) not posting data to server - orchardcms

Question

I created a new Content Part. I attached the Content Part to a Page Content Item. When editing the Page Content item, the custom Content Part Editor (that I created) shows correctly, having two fields only.
When I fill in data and hit "Save", the Driver's POST Editor action is receiving empty values for the custom part. I am making use of InfoSet in my Part class. However, I am also creating a migration to create a Table for the part record.
Here is some code:
using Orchard.ContentManagement;
using Orchard.ContentManagement.Records;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web;
namespace SlideShare.Models
{
public class SlideSharePartRecord : ContentPartRecord
{
public virtual string SlideShareId { get; set; }
public virtual int StartFromSlide { get; set; }
}
public class SlideSharePart : ContentPart<SlideSharePartRecord>
{
[Required]
public string SlideShareId
{
get { return Retrieve(x => x.SlideShareId); }
set { Store(x => x.SlideShareId, value); }
}
[Required]
[Range(1,20)]
public int StartFromSlide
{
get { return Retrieve(x => x.StartFromSlide); }
set { Store(x => x.StartFromSlide, value); }
}
}
}
using Orchard.ContentManagement.Handlers;
using Orchard.Data;
using System;
using System.Collections.Generic;
using SlideShare.Models;
namespace SlideShare.Handlers
{
public class SlideShareHandler : ContentHandler
{
public SlideShareHandler(IRepository<SlideSharePartRecord> repository)
{
Filters.Add(StorageFilter.For(repository));
}
}
}
using Orchard.ContentManagement;
using Orchard.ContentManagement.Drivers;
using SlideShare.Models;
using System;
using System.Collections.Generic;
namespace SlideShare.Drivers
{
public class SlideShareDriver : ContentPartDriver<SlideSharePart>
{
protected override string Prefix { get { return "SlideShare"; } }
protected override DriverResult Display(SlideSharePart part, string displayType, dynamic shapeHelper)
{
return ContentShape("Parts_SlideShare", () => shapeHelper.Parts_SlideShare(
SlideShareId: part.SlideShareId,
StartsFromSlide: part.StartFromSlide));
}
// GET
protected override DriverResult Editor(SlideSharePart part, dynamic shapeHelper)
{
return ContentShape("Parts_SlideShare_Edit", () => shapeHelper.EditorTemplate(
TemplateName: "Parts.SlideShare",
Model: part,
Prfix: Prefix));
}
// POST
protected override DriverResult Editor(SlideSharePart part, IUpdateModel updater, dynamic shapeHelper)
{
updater.TryUpdateModel(part, Prefix, null, null);
return Editor(part, shapeHelper);
}
}
}
#using System.Web.Mvc.Html
#model SlideShare.Models.SlideSharePart
<fieldset>
<legend>#T("SlideShare Presentation Fields")</legend>
<div class="editor-field">
#Html.LabelFor(x => x.SlideShareId, T("SlideShare Id"))
#Html.EditorFor(x => x.SlideShareId)
#Html.ValidationMessageFor(x => x.SlideShareId)
</div>
<div class="hint">#T("Enter the SlideShare Presentation Id")</div>
<div class="editor-field">
#Html.LabelFor(x => x.StartFromSlide, T("Start From Slide"))
#Html.EditorFor(x => x.StartFromSlide)
#Html.ValidationMessageFor(x => x.StartFromSlide)
</div>
<div class="hint">#T("Enter the Start From Slide")</div>
</fieldset>