Is it really that difficult for you to just tell me what to do?
Yes it is, if I don't know what exact exeption you are getting.
As already explained in the first reply to your post - these are the 2 most common errors:
a) the native bass.dll is missing in your executable directory (e.g. .\bin\Debug)?
b) you are compiling your app as for 'Any CPU' on a x64 OS and thus need to use the native x64 bass.dll?
You actually never replied to these questions/suggestions.
But without the exact error exception it is all just guessing?!
That's why I pointed you to the docs and the samples provided with Bass.Net - e.g. the 'MyFirstBass'.
To guess again:
Maybe you have not called "BASS_Init" within your code?