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Are those classes marked as private? If so make them public.
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these all are public classes
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I have an Asp.net Webapplication, with 2 visual basic projects all added inside one Solution. I can build both the Vb prjoject sucesfully and the corresponding dlls are adding into the Bin folder.But am not able to refer to the classes inside the Dll file.. Am getting a compiler error as below.<br />
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&nbsp;BC30002: Type 'DataAccessLayer.DataConne<wbr />ction' is not defined.
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I have an Asp.net Webapplication, with 2 visual basic projects all added inside one Solution. I can build both the Vb prjoject sucesfully and the corresponding dlls are adding into the Bin folder.But am not able to refer to the classes inside the Dll file.. Am getting a compiler error as below.

 BC30002: Type 'DataAccessLayer.DataConnection' is not defined.

Asp.net Application cannot refer to dlls

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.