i make a mp3 player ..... i make also a panel in this media player(mp3 player)i want to add songs like a song list with openfiledialoug plz help me
"no i just take a groupbox just ...... for creating a song list kindly tell me what can i do in this groupbox for this work"
Me? I wouldn't use a groupbox.
You want something that can act as a list - i.e. that makes it easy for you to add items at the bottom, and remove them from the top when they have played and so forth. If you use a groupbox, then you need to add controls dynamically within it, and it will not scroll well automatically.
Consider using a DataGridView, or a ListView - they both will work well with minimal effort on your part and are very easy to set up.
If you 'made an mp3 player', odds are you did next to nothing and just used the WMP control. It has events for when a file stops playing, and also playlists. So, just keep using the object to do what you want, and if you have a specific question, post the code for what you've done and explain where you are stuck.
This is not programming, you should write basic things that don't rely on black boxes. An API is great for a specific need, but not helpful for learning
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