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Editorial Team
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Asked: 2026-06-07T21:43:47+00:00

I was importing a old project and got a bunch of errors while building.

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I was importing a old project and got a bunch of errors while building. Most errors were similar, saying ‘type or namespace does not exist in the namespace etc’

I took one particular error which was about a missing namespace ‘System.Windows.Forms.Design.Behavior’.
I could see this namespace in Object browser:

object browser

But not in the Add Reference window:

enter image description here

I could not find any files with that name under this folder too.

G:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\

This namespace exists in msdn.

How do I use this namespace in my code?

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1 Answer

  1. Editorial Team

    You don’t find a file with exactly that name because it is not mandatory for a namespace to have the same name of the assembly containing it.
    The one you refer it is probably defined in System.Design.dll

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