If you want to submit to action, just using form
@using (Html.BeginForm("NewItems","Admin")){
@Html.DropDownList("compId", new SelectList(@ViewBag.Comps, "Id", "Name"), "-- select Comp --", new {id="ddlComp"})
@Html.DropDownList("divId", new SelectList(@ViewBag.Div, "Id", "Name"), "-- select Division--", new {id="ddlDiv"})
<button type="submit">Submit</button>
}
Or if you want load using jquery get, you should use callback function
$.get(url, {compId: compid, divId: divid}, function(data){
$('#divId').html(data);
});
Or you want return data using json?