Visual Studio 2010 add project reference then compiler says namespace could not be found

Question

I've added two c# class library projects to a Windows Application project, they turn up as expected and I can write some code that references the namespaces which are both declared at the top of the class (using) and the intellisense and syntax highlighting works as expected, but as soon as I build the code it tells me that the namespaces can't be found and asks me whether I'm missing a reference... the syntax highlighting also disappears. If I remove the references and add them again the highlighting comes back until I build it again and then the cycle just repeats itself. Any clues would be greatly appreciated.

I've tried cleaning the entire solution and also restarting VS.

As per commment/answer:

I had a reference to System.Web in the class project with a target of ".Net Framework 4" the Win Forms app was set to ".Net Framework 4 Client Profile" and wouldn't allow me to add System.Web, changing it to just ".Net Framework 4" fixed the issue

Check both project Target Framework, Are both same or not.

Yograj Gupta
– Yograj Gupta

2012-10-28 03:13:41 +00:00
Commented Oct 28, 2012 at 3:13 — Yograj Gupta
– Yograj Gupta, Commented Oct 28, 2012 at 3:13

Yograj Gupta · Accepted Answer · 2012-10-28 03:17:31Z

2

Check both project Target Framework, Are both same or not.

The issue can be that your are referencing a higher Target Framework project into a less Target Framework project.

Like If you have a project with Target Framework .Net Framework 4 and you are referencing it into a project with .Net Framework 4 Client Profile or .Net Framework 3.5, you will get the issue.

answered Oct 28, 2012 at 3:17

Yograj Gupta

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1 Comment

Rob Over a year ago

I had a reference to System.Web in the class project with a target of ".Net Framework 4" the Win Forms app was set to ".Net Framework 4 Client Profile" and wouldn't allow me to add System.Web, changing it to just ".Net Framework 4" fixed the issue

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