Web forms : Relative and Absolute positionning

<asp:Button ID="Button1" runat="server" Text="Button" style="position:absolute" />

http://blogs.msdn.com/b/webdevtools/archive/2008/03/11/absolute-and-relative-positioning-in-visual-web-developer-2008-designer.aspx

http://msdn.microsoft.com/en-us/library/ms533005%28VS.85%29.aspx