VB.NET - Graphics

I'm using VB.NET and I need to create functionality where I can select different parts of a jpeg image (like an image selector in photoshop) and return the co-ordinates. I then need to store those co-ordinates in a database so later on when I go to view the image I can tell where I have selected and where I haven't.

I'm not sure if this is the best way to do it. But I need to tell where different parts of an image are. It is for a map of a retirement village and they have different units and I need to associate each unit number with an area on the diagram so my program can tell where each unit is.

If you can help me out with some code or a better suggestion on how to do it I will be very grateful.
AndrewADunnAsked:
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omid_krdCommented:
Create a winform and put a picturebox on it named "pic" :
----------------------------
    Private pt As Point, lastPt As Point, startPt As Point
    Private selecting As Boolean

    Private Sub pic_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles pic.MouseDown
        selecting = True
        lastPt = New Point(e.X, e.Y)
        startPt = lastPt
    End Sub

    Private Sub pic_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles pic.MouseMove
        If (selecting) Then
            Dim rect As Rectangle
            Dim pt1 As Point = pic.PointToScreen(startPt)
            rect = New Rectangle(pt1.X, pt1.Y, lastPt.X - startPt.X, lastPt.Y - startPt.Y)
            ControlPaint.DrawReversibleFrame(rect, Color.Black, FrameStyle.Dashed)
            lastPt.X = e.X
            lastPt.Y = e.Y
            rect = New Rectangle(pt1.X, pt1.Y, lastPt.X - startPt.X, lastPt.Y - startPt.Y)
            ControlPaint.DrawReversibleFrame(rect, Color.Black, FrameStyle.Dashed)
        End If
    End Sub

    Private Sub pic_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles pic.MouseUp
        If (selecting) Then
            Dim rect As Rectangle
            Dim pt1 As Point = pic.PointToScreen(startPt)
            rect = New Rectangle(pt1.X, pt1.Y, lastPt.X - startPt.X, lastPt.Y - startPt.Y)
            ControlPaint.DrawReversibleFrame(rect, Color.Black, FrameStyle.Dashed)
        End If
        selecting = False
    End Sub
-----------------
After mousedown the positions are stored in startPt and lastPt
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