How to create project library in DotNetNuke 4.X

In many of our ICPC custom modules, the mid-tier and database providers are kept in two separate project libraries.  This article will show how to create library source code for JobXP module, namely ICPC-JobXP and ICPC-JobXP.SqlDataProvider.  Once the project library is created, it can be compiled into DLL file.  Below screenshots provide step by step

To add new project, right mouse click on solution and select Add >> New Project
Select Library folder (same level a Website)
Delete Class1 sample vb files
Clear root name space and specify Assembly name
Update Build output path Specify compile path to [DNN root]\bin folder
Reference the two library project in DotNetNuke project