vb net class library dll file missing

Computer: HP Lab Top
Programming App: VB Net 2005
OS: Windows 7
Issue:
1. I created a class library
2. I selected build - build solution name
3. A dll was created in the bin/debug directory
4. I used the dll in other projects
5. I went to edit the class library
6. I selected build -> build solution name
7. I went back to the other project and added a reference to the dll file again
8. There was not change to the dll file
9. I went to the bin/debug directory
10. I deleted the dll files
11. brought the class library in the vb net 2005 environment
12. ensured the changes I wanted were made
13. I selected build -> build solution name
14. Received message that build was successful
15. However, I could not find the dlll file in the bin/debug directory

Please tell me what I'm doing wrong and how I can resolve this issue

thanks