What is the best way to release memory in VB .NET ?

In VB.NET, I open a form in my application where I will place some charts using XTRACHARTS library.

Then, the memory gets is increased a lot, and when I close the form, the memory is never released any more.

Following, the sub that I close the form.

Private Sub XtraCharts_Close(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles MyBase.FormClosed

Me.PanChart.Controls.Remove(AreaChart)   ' AreaChart is the chart object defined as private
Me.AreaChart = Nothing
' I believe that the following is not necessary, but I put it, in order to see what happen...!!
While Me.Controls.Count > 0
           For Each ControlObj As Windows.Forms.Control In Me.Controls
                 Me.Controls.Remove(ControlObj)
                 ControlObj = Nothing
            Next
End While
Me.Close()

End Sub

Following, the code executed in the main form, that calls the "XtraCharts" form, and where I am trying to release the resources used by the charts objects (inside the "XtraCharts" form)

        XtraCharts.ShowDialog()
        XtraCharts = Nothing
        XtraCharts.Dispose()
        GC.Collect()
        GC.WaitForPendingFinalizers()

By the way, if I try the following:

            While Not XtraCharts.IsDisposed
                XtraCharts = Nothing
                XtraCharts.Dispose()
                GC.Collect()
                GC.WaitForPendingFinalizers()
            End While

The loop never ends. In other words, XtraCharts.IsDisposed is allways false.....!!!

I am so confused about how to use the GC.

I need an example of the correct way to guarantee to release the unused memory...!!!

Thanks in advance,
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