c# - The type or namespace name does not exist in the namespace ''are you missing an assembly reference ?" -

i have solution worked fine until last couple of days contains around 15 projects dlls or webforms applications. use resharper peculiarity related solution.

there naturally projects referencing other ones within solution , 1 compile independently , run ok except 1 webforms app (a) refers namespaces within webforms app(b) dll.

(a) has 7 exceptions when try debug along lines of "the type or namespace name [myclass] not exist in namespace '[(b) namespace]' (are missing assembly reference?)"

all projects target same .net version 3.5 target same processor cpu architecture, have cleaned solution, recreated reference (b) (a), can see namespace in object explorer when looking @ (a)\bin it's there... still (a) @ build has these errors above , on day cannot life of me work out why... can help?

if run webform app (b), builds , runs without problem...

the mention of resharper due not working solution anymore (but work others solutions), behaviour of resharper solution cannot type characters vs anymore unless resharper suspended. when searching types list not filter down @ - there sort of corruption there although have cleared caches related resharper.

the problem might virtual directory in iis, not pointing correct folder, page couldn't find dlls