Simplified Resource Management with the DisposableCollection Class

'////////////////////////////////////////////////////////////////////////////////////
'// Form1.cs
'//
'// By Scott McMaster (smcmaste@hotmail.com)
'// 09/25/2004
'//
'// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, 
'// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES 
'// OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
'////////////////////////////////////////////////////////////////////////////////////
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call
        SetStyle(ControlStyles.ResizeRedraw, True)
    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        components = New System.ComponentModel.Container
        Me.Text = "Form1"
    End Sub

#End Region

    '// Do some painting using DisposableCollection to manage our GDI+ instances.
    Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
        MyBase.OnPaint(e)
        Dim g As Graphics = e.Graphics

        Dim dc As New DisposableCollection
		
        '// When the Finally block executes, the DisposableCollection cleans up
        '// all instances that have been added to it.
        Try
            Dim ellipseBrush As New SolidBrush(Color.Red)
            dc.Add(ellipseBrush)

            Dim textFont As New Font("Arial", 16)
            dc.Add(textFont)

            Dim textBrush As New SolidBrush(Color.Black)
            dc.Add(textBrush)

            g.FillEllipse(ellipseBrush, ClientRectangle)
            g.DrawString("Hello World", textFont, textBrush, 50.0F, 50.0F)
        Finally
            dc.Dispose()
        End Try

    End Sub
End Class