Compiler Error Message: CS0234: The type or namespace name ''(are you missing an assembly reference?)

Compiler Error Message: CS0234: The type or namespace name 'Article_SQL' does not exist in the namespace 'CollegeSoft.DBUtility' (are you missing an assembly reference?)

 

The name 'BorderDetails' IS in the Infragistics.WebUI.Shared assembly.

The assembly in question was added to the project's references when an UltraWebGrid was placed on a page.

So, everything seems 'normal'  but the project doesn't run.

 

I solved the problem by setting the reference's CopyLocal property to true.

(highlight Infragistics.WebUI.Shared under References in the Solution Explorer. View the properties. Set CopyLocal = true)