How to Update the Version of DLL ( Old to New )

Goto
Control panel --->
Administrative tools -->
Microsoft .NET Framework 1.1 Configuration -->
goto
Configured assemblies -->
click
Configure an Assembly and
select the old Asembly Name which is having old version version which is
present their
One Popup window with 3 tabs will come
select the Binding Policy
their in "Requested Version" u give the old version name
and in "New Version" give the New Version name which u want all the appln to
use
when ever the old assembly is accessed then that will enroute it to
the version which u mentioned in "New Version"