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[DllImport("winmm.dll")]
 
    private static extern long mciSendString(string strCommand, 
    StringBuilder strReturn, int iReturnLength, IntPtr oCallback);
 
    static void Main(string[] args)
    {
        string strFileName = @"C:\1.mp3.";
        string PlayCommand = @"open " + strFileName + "alias MediaFile";
 
        mciSendString(PlayCommand, null, 0, IntPtr.Zero);
 
 
 
        PlayCommand = "play MediaFile";
 
        mciSendString(PlayCommand, null, 0, IntPtr.Zero);
        Console.ReadKey();
}

prog.cpp:8:30: error: stray ‘@’ in program
         string strFileName = @"C:\1.mp3.";
                              ^
prog.cpp:9:30: error: stray ‘@’ in program
         string PlayCommand = @"open " + strFileName + "alias MediaFile";
                              ^
prog.cpp:1:1: error: expected unqualified-id before ‘[’ token
 [DllImport("winmm.dll")]
 ^
prog.cpp:6:22: error: variable or field ‘Main’ declared void
     static void Main(string[] args)
                      ^~~~~~
prog.cpp:6:22: error: ‘string’ was not declared in this scope
prog.cpp:6:29: error: expected primary-expression before ‘]’ token
     static void Main(string[] args)
                             ^

Standard output is empty