How to do wildcard in dropdownlist kendo MVC?

<div class="form-group">
     @Html.LabelFor(model => model.Reviewer)
     <div class="col-sm-9">
           @(Html.Kendo().DropDownListFor(model => model.ReviewerId)
               .Name("ReviewerId")
               .Filter(FilterType.Contains)
               .DataTextField("FullName")
               .DataValueField("Id")
               .OptionLabel("Select...")
               .DataSource(source =>source
                .Read(read => read.Action("Read","Reviewers").Data("filterReviewers"))
                .ServerFiltering(true)
                 )
               )
  </div>
</div>

<script>
     function resetReviewers(e) {
       var ddl = $("#ReviewerId").data("kendoDropDownList");
         if (ddl)
           ddl.dataSource.read();
         }

       function filterReviewers(e) {
         return {
           subZoneId: $("#SubZoneId").data("kendoDropDownList").value(),
           unitId: $("#UnitId").data("kendoDropDownList").value(),
         }
        }
     </script>