VB: Using statement still uses too much memory - Solved

[NinjaNic]

Hi!
I guess I must still be a newbie at this.

So, I'm making a game which heavily uses graphics. I heard that the Using statement is supposed to dispose all resources from that element when it reaches End Using. However in Debug mode, the memory still rises to a scary amount (1 GB) before automatically disposing resources.
Would it be more efficient, or more risky, or just plain stupid to call GC.Collect() every frame of the game? Does GC remove all unnecessary resources from all parts of the program, or just in that Sub, or .VB file?

Anyway, here's an example of my code:

    Private Sub Form1_Paint(sender As Object, e As PaintEventArgs) Handles Me.Paint

        Dim Screen_W As Int32 = 6
        Dim Screen_H As Int32 = 6

        Dim srcR As New Rectangle(0, 0, Screen_W * 24, Screen_H * 24)

        Dim B As New Bitmap(Screen_W * 24, Screen_H * 24)

        Using G As Graphics = Graphics.FromImage(B)
            Select Case Lv
                Case Level.Lv1
                    ' G.DrawImage ... (a lot)
                Case Level.Lv2
                    ' G.DrawImage ... (a lot)
            End Select
        End Using

        e.Graphics.DrawImage(B, ClientRectangle, srcR, GraphicsUnit.Pixel)

    End Sub

(Form1_Paint happens very frequently.)

Thanks in advance for the help!
~Nic