<div id="rolesValues" class="case-assignment-hide">
        @Html.DropDownList("ddlRoleValues", new SelectList(@Model.Roles, "Key", "Value"), new {@id= "ddlRoleValues", @class = "form-control case-assignment-rule-use-values", multiple = "multiple" })
        <span class="field-validation-valid help-block" data-valmsg-replace="true"></span>
</div>

$("#ddlRoleValues").on("change", function () {
            alert('I got the hit');

        });