asp.net mvc - why DropDown() helper method does not display the dropdown when it was used in a C# block? -

i have following view code generate drop down list control.when code written in c# block not display drop down

here code

@{     viewbag.title = "index";     html.dropdownlist("id", model.catcoll);     }

but when write outside of c# block displays.. why happens , how fix this?

whatever inside @{ } should c# code, whatever outside of it, should asp.net code.

if want combine 2 in order display c# values inside html, can use following style: @someproperty

example:

<h1>@viewbag.title</h1>

fix problem, put dropdownlist outside:

@html.dropdownlist("id", model.catcoll);

Ben