how can get previously selected value in dropdown list in edit page

I am using viewbag to put data in dropdownlist. In my edit page, I want to have selected value as the default value in my dropdown list. I am sending dropdownlist from the controller class a开发者_运维百科s follows:-

ViewBag.WareHouseId = new SelectList(db.WareHouse, "ID","Description");

my view code for dropdownlist is:-

@Html.DropDownList("WareHouseID","SELECT")

what should I add in the above line to show previously selected value before changing the value of drop downlist.?

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Pass the model value to the optionLabel parameter:

@Html.DropDownList("WareHouseID", "SELECT", Model.WareHouseID)