After
downloading the control and follow the installation instructions,
you would only have to drag the control from your toolbox.
The head of the page would be something like:
<%@ Register Assembly="FUA" Namespace="Subgurim.Controles" TagPrefix="cc1" %>
And your .aspx would have something like:
<cc1:FileUploaderAJAX ID="FileUploaderAJAX1" runat="server" />
Remember that you need to import the library to use it:
C#: using Subgurim.Controles;
VB.NET: Imports Subgurim.Controles