LoadControl problem for 3.5



The problem is we have to move from framework 2 to 3.5 version
and some code start give me an error.
//framework 2 (works correct)
LayoutParts_SessionWork pWork =
this.LoadControl("~/LayoutParts/SessionWork.ascx") as LayoutParts_SessionWork;

pWork get class and works fine, but in 3.5 version thee same code give me
an error because pWork is NULL.
I have tried other way of convertion object to class
LayoutParts_SessionWork pWork =
and it works correct on both.

The question: why "object as [class name]" stop working? I need to do tons
of work because of it. Can somebody told me what is wrong?


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