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private void menuItem1_Click(object sender, System.EventArgs e)
{ OpenFileDialog ofDialog = new OpenFileDialog();
ofDialog.AddExtension = true;
ofDialog.CheckFileExists = true;
ofDialog.CheckPathExists = true;
//the next sentence must be in single line
ofDialog.Filter = "VCDÎļþ(*.dat)|*.dat|AudioÎļþ(*.avi)|*.avi
   |WAVÎļþ(*.wav)|*.wav|MP3Îļþ(*.mp3)|*.mp3|ËùÓÐÎļþ (*.*)|*.*";
ofDialog.DefaultExt = "*.mp3";
if(ofDialog.ShowDialog() == DialogResult.OK)
{
  this.axMediaPlayer1.FileName = ofDialog.FileName;
}
}
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using System.Collections;
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using System.Web;
using System.Web.SessionState;
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