namespace could not be found problem

[yeap7]

Hi

strange thing..
I created an empty solution then added a web page (UI) and a class library (BL)
I added a reference to the UI and I can see BL.dll and BL.pdb under the Bin folder of the web page . when I try to refer to BL in the web page I get the error :
error CS0246: The type or namespace name 'BL' could not be found (are you missing a using directive or an assembly reference?)
It is very starnge because I added references of class lib before..
and when i load an old project that used to work.. I get the same error !
what happened..?

Thanks

[nabeelisnabeel]

Suppose you have a class named ABC and namespace XYZ in the BL.dll and you are trying to access it using ABC in your source code. Now youhave two ways to access your class.

1- Write 'using' statement in the start of your file declaring the namespace of your ABC class.
2- Access your class with full qualified name i.e. XYZ.ABC

[yeap7]

Thx
I re-installed VS and now it works..