variable in ASP not working

Probably a simple answer to this. In php, something like this would work fine. Why doesn't this code work? The variable "Does not exist under the current 开发者_如何学JAVAcontext".

    <% string var = Page.Request.Form["DropDownList1"]; %>
    <title><% Response.Write(var); %></title>

Thanks

A variable declared in a Content Control is scoped only within the Content Control

See here for an example