asp.net mvc - DropDownList setting selected item in MVC5 -

how can set default value drowdownlist?

i have this:

@html.dropdownlistfor(model => model.businessid, (selectlist)viewbag.businesses, new { @class = "form-control" }) 

edit:

    // get: reviews/create     public actionresult create()     {         viewbag.businesses = new selectlist(db.businesses, "businessid", "businessname");         return view();     }      [httppost]     [validateantiforgerytoken]     public actionresult create([bind(include = "reviewid,reviewtext,rating,businessid")] review review, int id)     {         if (modelstate.isvalid)         {             db.reviews.add(review);             db.savechanges();             return redirecttoaction("details", "businesses", new { id = review.businessid });         }          review.businessid = id;         viewbag.businesses = new selectlist(db.businesses, "businessid", "businessname", review.businessid);         return view(review);     } 

how call it:

@html.actionlink("write review", "create", "reviews", new { id = model.businessid }, null) 

and point each businessid, has value, , call them let's /reviews/create/15, in case businessid 15. , when page loads, want item businessid 15 selected default. whenever load page, selects 1 lowest businessid.

update:

changing action solved problem:

        public actionresult create(int? id)         {             viewbag.businesses = new selectlist(db.businesses, "businessid", "businessname", id);             return view();         } 

you should using typed versions, makes easier, , less error prone.

@html.dropdownlistfor(x => x.businessid, model.businesses, new { @class="form-control" }) 

here. model.businesses ienuerable (which can list, collection, array, etc..)

or can use viewbag, so:

@html.dropdownlistfor(x => x.businessid, viewbag.businesses, new { @class="form-control" }) 

now, i'm unclear on mean "default value" here. mean want set value value in database? in case, populate model.businessid value want set (make sure it's value, not text) , automatically select when renders page.

if mean want "select business..." use "option" overload:

@html.dropdownlistfor(x => x.businessid, viewbag.businesses, "select business...", new {@class="form-control" }) 

note: not name list of selectlistitems (or selectlist) same selected item property, ie.. not this:

@html.dropdownlistfor(x => x.businessid, viewbag.businessid, "select business...", new {@class="form-control" })