Visual Studio C# Project Reference not working -


i created solution in vs 2 projects, 1 "core" class library project, other app project. added class numberutil (uses namespace core.util) , want reference in app project choose r-click, add ref... pick projects , add core project reference. ref core appears under references in project explorer if try use numberutil in class in app project can't find it.

anyone know i'm doing wrong here? i'm not new programming new vs , c#.

did use using core.util instruction? when try use class, vs propose using instruction you. can click on code error , press alt+shift+f10.


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