does .net provide any control to upload file? as I need to use the following control to upload fil
<input id="Upload1" type="file" name="Upload1" runat="server"
but when I post back to server(haven't save the form yet, but doing other action), this control's value will lost. While other server control can keep their value

(Or I need to use a variable to store it, and when load the page that containing this control, I need to get the value of the variable, then assign to the file control. But it is true that I need to use the old way as asp does to remember the file control's value?

Check out this article on CodeProject:
http://www.codeproject.com/aspnet/fileupload.asp

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action), this control's value will lost. While other server control can
keep their value.
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containing this control, I need to get the value of the variable, then
assign to the file control. But it is true that I need to use the old way
as asp does to remember the file control's value?)
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On postback what is the value of Upload1.PostedFile ?

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it contains problem that the value of the contorl does not save at server
automatically, so that I need to assign a variable to store it.