How to get id of selected Item in dropdownlist?

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MVC

MVC4

DropDownList

ASP.NET4

I want to get the selected Id of DDL in MVC i am not using Html helpers to generate Dropdownlist but simple <select></select>

Id = Request.Form["ddl1"].ToString();

It is not working for me.I am trying to get the Id from View and passing the Id to same View having another Dropdownlist

foreach (System.Data.DataRow dr in Class.Getddl2(Id).Rows)

Getddl2 is a method in my class and i am passing that Id to ddl.

This whole code is in View and not in controller or Class.

please note that i am requesting the Id when i reload the page using Ajax.