ASP.NET 1.1 and ASP.NET 2.0 mixed...It doesn't work...help!!

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there are one web application,"MainApp", built with ASP.NET 1.1.
I made another web application,"SubApp", using ASP.NET 2.0.
I have to use "SubApp" inside "MainApp" such as
http://servername/MainApp/SubApp/default.aspx.

It doesn't work.
Do you know how to set up correctly to work?

Thanks


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