WebUserControl and Dynamic Control Creation

I've a simple web user control, inside it, I've some dropdownlists that I populate and fill them in Page_Init event of page.
When I drag and drop my control on page, it works well and as expected.

But when I try to dynamically add controls to a page, (for example in Page_PreInit event of the page, by coding:
        WebUserControl w = new WebUserControl();

"Object reference not set to an instance of an object." error occurs (for this.DropDownList1.Items.Add("1");)

I think I should read more about Page Life Cycle, but any direct help, would be highly appreciated.
LVL 12
Mortaza DoulatyAsked:
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Add a 'PlaceHolder' and try like this.

Control FeaturedProductUserControl = LoadControl("WebUserControl1.ascx");

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