asp.net mvc - Styling a dropdownlist using bootstrap -

@using (html.beginform()) {

            <label class="btn btn-success">genre</label> @html.dropdownlist("moviegenre", "all")              title: @html.textbox("searchstring")                 <input type="submit" class="btn btn-warning" data-loading-text="finished" value="filter" />         </p> 

can advise how style dropdown list in mvc using bootstrap. getting dropdownlist objects table , works fine can't style other defualt.

@html.dropdownlist("moviegenre", (selectlist)viewbag.genre, "select genre", new { @class = "form-control" })

here code struggling grey area of drop down lists , styling