Fluent API to capture custom Field

In my blog post section I've created a custom field called preview image. I see its stored in the database and has the appropriate values. Now im trying to render that field into my markup. When I make a call through the Fluent API to retrieve a list of Blog Posts Im not sure how I can capture that custom field. I've tried dataItem.GetValue<string>("preview_image") but that throws an error.

Here is how Im capturing all the data:

var articles = App.WorkWith().BlogPosts().Get().Where(ab => ab.Parent.Title == ARTICLESBLOGNAME && ab.Status == ContentLifecycleStatus.Live).OrderByDescending(ab=>ab.PublicationDate);

I then bind this to a ListView and it displays all the data like Summary, Title and such as you would expect...I think set up a OnItemDataBound event:

protected void ArticlesItemDataBound(object sender, ListViewItemEventArgs e)

if(e.Item.ItemType == ListViewItemType.DataItem)

var dataItem = (BlogPost)((ListViewDataItem) e.Item).DataItem;

var link = (HyperLink)e.Item.FindControl("NavHyperLink");

link.NavigateUrl = string.Format("/articles0", dataItem.Urls.FirstOrDefault().Url);

var previewImage = (Image)e.Item.FindControl("PreviewImage");

var imageUrl = dataItem.GetValue<string>("preview_image");

if (string.IsNullOrEmpty(imageUrl)) return;

previewImage.ImageUrl = string.Format("/img/featured/0", imageUrl);

I know DataItem is not null because it sets the appropriate navigate url...but when I try and get the custom field it throws out a Object not set error.

Any ideas?

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