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Editorial Team
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Asked: 2026-05-17T01:32:02+00:00

Similar to this question I am porting a web application to 4.0. It has

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Similar to this question

I am porting a web application to 4.0. It has a root web.config that adds a namespace:

  <namespaces>
    <add namespace="Insignia.Catalog2"/>
    ...
  </namespaces>

There is a sub-folder to this app with its own web.config:

  <namespaces>
    <remove namespace="Insignia.Catalog2"/>
    <add namespace="Insignia.Catalog"/>
  </namespaces>

.Catalog and .Catalog2 have overlapping class names. This worked great in ASP.NET 2.0 thru 3.5 but seems broken in 4.0 – that is, I now get compiler errors about the colliding class names.

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1 Answer

  1. Editorial Team

    Well I figured it out. While the ‘remove’ tag WAS removing .Catalog2, another DLL had changed to include a reference to that namespace. Using a control from that other DLL brought .Catalog2 along with it! Fixing the reference solved the problem.

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