Excellent manual for understand the pattern Observer. the original article is http://msdn.microsoft.com/es-es/library/bb972192.aspx

PatronObserverVB\PatronObserverVB\bin\Debug\PatronObserverVB.exe
................\................\...\.....\PatronObserverVB.pdb
................\................\...\.....\PatronObserverVB.vshost.exe
................\................\...\.....\PatronObserverVB.xml
................\................\ColorDelegate.vb
................\................\ColorObserver.Designer.vb
................\................\ColorObserver.resx
................\................\ColorObserver.vb
................\................\DiagramaClases.cd
................\................\Form1.Designer.vb
................\................\Form1.resx
................\................\Form1.vb
................\................\Interfaces.vb
................\................\ListObserver.Designer.vb
................\................\ListObserver.resx
................\................\ListObserver.vb
................\................\My Project\Application.Designer.vb
................\................\..........\Application.myapp
................\................\..........\AssemblyInfo.vb
................\................\..........\Resources.Designer.vb
................\................\..........\Resources.resx
................\................\..........\Settings.Designer.vb
................\................\..........\Settings.settings
................\................\obj\Debug\PatronObserverVB.ColorObservador.resources
................\................\...\.....\PatronObserverVB.ColorObserver.resources
................\................\...\.....\PatronObserverVB.exe
................\................\...\.....\PatronObserverVB.Form1.resources
................\................\...\.....\PatronObserverVB.listaObservador.resources
................\................\...\.....\PatronObserverVB.ListObserver.resources
................\................\...\.....\PatronObserverVB.pdb
................\................\...\.....\PatronObserverVB.Resources.resources
................\................\...\.....\PatronObserverVB.vbproj.GenerateResource.Cache
................\................\...\.....\PatronObserverVB.xml
................\................\...\PatronObserverVB.vbproj.FileList.txt
................\................\PatronObserverVB.vbproj
................\................\PatronObserverVB.vbproj.user
................\PatronObserverVB.sln
................\PatronObserverVB.suo
................\................\obj\Debug\TempPE
................\................\bin\Debug
................\................\obj\Debug
................\................\bin
................\................\My Project
................\................\obj
................\PatronObserverVB
PatronObserverVB

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