Release Media Player resources

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VB

I am creating an application in Vb.Net that consists of one textbox to display the file name, one axwindowsmediaplayer and 5 buttons:
1.Load File
2.Play
3.Pause
4.Stop
5.Clear
I have coded all the buttons successfully. The issue is with 'clear' button. I want that on clicking the 'clear' button, textbox field is cleared and also axwindowsmediaplayer resources should be released so that the media player is not able to play anything unless there is some file loaded again. How can I program it?
I have already tried this code for the clear button:
textbox1.text=""
AxWindowsMediaPlayer1.URl=""
AxWindowsMediaPlayer1.Ctlcontrols.stop()