Hi: What is Base.net? For standard .net projects in VS or express modules you have to add the dll to the referenced objects. I do it under the Project menu in vb.net. Under that menu is a item called something like Add Reference. I click it and tab to the browse button. Then I navigate to the dll in question and tab and hit enter. That adds a reference to the dll in the project. If this has nothing to do with what you are doing sorry, never heard of Base.net and couldn't find a quick article googling so posted the closest thing I remembered that might apply. Rick USA ----- Original Message ----- From: Mesut To: programmingblind@xxxxxxxxxxxxx Sent: Tuesday, March 15, 2011 4:41 PM Subject: Re: About bass.net the file is at same directory. debug\bin but I can't understand why does it do so ----- Original Message ----- From: Littlefield, Tyler To: programmingblind@xxxxxxxxxxxxx Sent: Tuesday, March 15, 2011 9:22 PM Subject: Re: About bass.net The DLL not found exception just means that the dll was not found. put the dll it wants in the bin directory and try again. On 3/15/2011 1:01 PM, Mesut wrote: Hi all I've first worked with Bass.Net this evening. And I tried the first example. But I've caught a dll not found exception. Now that you've experienced, you must know. Can you help me? The second matter is: Have you any article simply to play an mp3 file? -- Thanks, Ty