Slider Control to maintain Volume

Question

Hello,

 

I am just making an simple media player application. In that I am trying to keep a Slider in order to maintain the volume of the audio. But I am getting an exception like object reference not set to instance of a object

 

The code is like below:

 

//volrocker is name of the slider

//me is the name of the media player 

private void volrocker_ValueChanged(object sender, RangeBaseValueChangedEventArgs e)

{

if (me.IsMuted)

{

me.IsMuted = false;

}

if (me.Volume > 0)

{

me.Volume -= volrocker.Value;

}

}

 

Help me in writing the code..........