That is a bit hard to write a mp3 player in C#. I think you may need to find third party mp3 decoder dll. But if you only want to play to a wav file, that is very easy. .Net libraries already have a control class for you.

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All you need to put the file name into the constructor

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Then you can play and stop the file by these methods:

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This afternoon, I wrote an example project for this. Moreover, this project is implemented in WPF rather than normal Windows Forms, because I wish to practice my WPF skills.

Download the example project, please click here.