Width of the Dropdown on ASP.NET MVC View Page

I am wondering h开发者_如何转开发ow we can set the width of the Dropdown. When i write the below line of code, I am getting compilation error.

Appreciate your responses.

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<%= Html.DropDownList("product", (SelectList) ViewData["product"], new { style = "width: 300px;"})%>

because I think ViewData["product"] is considered as object so its thinks it is the overload html attributes