I'm trying to send a dropdownlists selected value to controller and retrieve json data back. 

When I debug, parameter gets to controller nicely, values are retrieved nicely but after return part on console it says

> 
> "Failed to load resource: the server responded with a status of 500 (Internal Server Error)`"
> 
> 
> 

This is my controller action: (in `WebContentsController`)

```
[HttpGet]
public JsonResult GetWebContentTypeDetails (int id)
{
    var details = db.WebContentTypeDetail.Where(x=>x.WebContentTypeID == id).ToList();
    return Json(details, JsonRequestBehavior.AllowGet);
}

```

this is JS part (printing it to console for testing)

```
$(document).ready(function () {
    $("#WebContentTypeID").change(function () {
        var ChangedID = $('#WebContentTypeID option:selected').val();
        alert(ChangedID);
        $.getJSON('/webcontents/GetWebContentTypeDetails/' + ChangedID, function (data) {
            console.log(data);
        })
    });
});

```

EDIT:

WebContentTypeDetail model 

```
public partial class WebContentTypeDetail
    {
        public int WebContentTypeDetailID { get; set; }
        public int WebContentTypeID { get; set; }
        public string DetailKey { get; set; }
        public string Description { get; set; }
        public Nullable<short> Rank { get; set; }

        public virtual WebContentType WebContentType { get; set; }
    }

```

WebContentType model

```
public partial class WebContentType
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public WebContentType()
        {
            this.WebContent = new HashSet<WebContent>();
            this.WebContentTypeDetail = new HashSet<WebContentTypeDetail>();
        }

        public int WebContentTypeID { get; set; }
        public string DisplayName { get; set; }
        public string CreatedByUserID { get; set; }
        public System.DateTime CreateDate { get; set; }
        public string LastEditedByUserID { get; set; }
        public Nullable<System.DateTime> LastEditDate { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<WebContent> WebContent { get; set; }
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<WebContentTypeDetail> WebContentTypeDetail { get; set; }
    }

```