C# 2008 projects share a database file

I looked at the link you referred to and I have a question about your statement,"Now right click both your projects and add reference and select the project just created.".
   Do you have to create any other logic for the *.dbml file access to work in the two separate project files? You I need to instantiate any objects, do I need to create any new methods?

  Can you show me any extra that is required?

I answered your question already in thread
http://www.c-sharpcorner.com/Forums/Thread/185873/C-Sharp-accessing-several-proejct-folders-in-same-solution-is.aspx 


Its

download this sample
http://www.c-sharpcorner.com/UploadFile/SukeshMarla/3-tier-architecture-using-Asp-Net/


There you can see example of class library

Let me kniw what else issue you have,


Check this is correct answer if it helped.