namespace not found!

Question

I created a solution called Foo. Added a class library called Foo.Common Added a console app to call the library code from called ConsoleApp.

I referenced the Foo.Common from ConsoleApp and typed :

using Foo.Common;
public class Program
{
    CommonClass c = new CommonClass();            

    static void Main(string[] args)
    {
    }
}

and get this back :

Error 1 The type or namespace name '**Foo**' could not be found (are you missing a using directive or an assembly reference?) Z:\Foo\Solution1\ConsoleApplication1\Program.cs 3 11 ConsoleApplication1

Why am i getting this?

what s going on?

Answer 1

Make sure that

• The ConsoleApp project has a reference to the Foo.Common project (do not browse for Foo.Common.dll),

  

• the file contains a using directive for the namespace in which CommonClass is declared, and

• CommonClass is declared as public.

So your files should look like this:

---

CommonClass.cs in Foo.Common project:

namespace Foo.Common
{
    public class CommonClass
    {
        public CommonClass()
        {
        }
    }
}

---

Program.cs in ConsoleApp project:

using Foo.Common;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main()
        {
            CommonClass x = new CommonClass();
        }
    }
}

Answer 2

Ensure that under your project settings, the target framework is set as .NET Framework 4 and not .NET Framework 4 Client Profile. I got this same behavior when it was set to Client Profile and it was fixes as soon as I set it to just the regular .NET Framework 4.