Filter table based from dropdown - dataset

Question

I have a partialview for my table, I want that every time the dropdown is changed the table will refresh acording to the dataset record. But having an error of 

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user’s experience. For more help http://xhr.spec.whatwg.org/

It appears when I added this script:

$("#txtCategory").change(function () {
    var value = (this).value
    $("#tblAssessment").load('@Url.Action("getcategory", "assessment")/' + value);

});

In my controller assessment:

    public ActionResult GetCategory(string ID)
    {
        dynamic model = new ExpandoObject();
        var serviceentry = new wmssoft_srm.Models.ServiceEntryFields();
        model = serviceentry;

        #region "getqacategory"
        model.GetQA = GetQACategory(ID);
        #endregion

        return View("_assessment", model);
    }

    private List<wmssoft_srm.Models.ServiceQACategory> GetQACategory(string category = "")
    {
        WMSSOFT_WCF_Service.WMSSOFT_InterfaceClient wmsSR = new WMSSOFT_WCF_Service.WMSSOFT_InterfaceClient();
        DataSet dsl = new DataSet();
        DataSet dsO = new DataSet();
        string a = "ValidateCredentials";
        string b = category.ToString() + "~~";

        //b = wmsSR.fCallWMSSOFTService(a, null, ref dsl, ref dsO);
        b = wmsSR.fCallWMSSOFTService("GetSRMQuestionsByCategory", b, ref dsl, ref dsO);

        if (b == "OK ~~")
        {
            if (dsO.Tables[0].Rows.Count >= 0)
            {
                DataTable oDT = new DataTable();
                oDT = dsO.Tables[0];

                wmssoft_srm.Models.ServiceEntry slData = new Models.ServiceEntry();
                var myList = slData.GetQACategory(oDT);

                return myList;
            }
        }
        return null;
    }

}

 And for my Model:

 

    public List<ServiceQACategory> GetQACategory(DataTable oDT)
    {
        List<ServiceQACategory> slData = new List<ServiceQACategory>();
        for (int i = 0; i < oDT.Rows.Count; i++)
        {
            ServiceQACategory sl = new ServiceQACategory();

            sl.questionId = Convert.ToInt32(oDT.Rows[i]["QID"].ToString().Trim());
            sl.question = oDT.Rows[i]["QUESTION"].ToString().Trim();

            slData.Add(sl);
        }

        return slData;
    }

}

public class ServiceQACategory
{
    public int questionId { get; set; }
    public string question { get; set; }
}

 

 Thanks