Stopping a database Reader

[Zero1UP]

When the form closes I need the reader to stop otherwise even after I end debugging it's still connected to the emulator

What I have so far

public frm_rfid_reader()
        {
            InitializeComponent();
            this.Closing += new CancelEventHandler(frm_rfid_reader_Closing);
        }

 private void frm_rfid_reader_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {

            }

This is what I had in vb.net that worked:

 Private Sub frmReader_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
        ' Disconnects from external software
        Me.mReader.Disconnect()
        Me.Dispose()
        Application.Exit()
    End Sub

I can't seem to figure out the equivelent in C# because I tried that above and I end up with this error

Error 1 Only assignment, call, increment, decrement, and new object expressions can be used as a statement