Using a configuration file, your 1.0 app can run on 1.1 framework.

Or you can just build your projects using VS 2003, and the app will run on
1.1 framework only.

For breaking changes between 1.0 and 1.1, as well as other compatibility
information, you can refer to <http://www.gotdotnet.com/team/changeinfo/>.

Hope this helps.

Regards,
Xin

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the information at the following link regarding Microsoft Security Bulletin
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MS03-026.

Hi

If the you have no breaking changes your v1.0  code will run on v1.1 . You
can also help the runtime  by specifying the following on the config file.
The following link has combinations of framework installed on the runtime
m/c and the developer m/c and what should the config file look like.

Checkout
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp
contargetingnetframeworkversion.asp