Vs2013 development- the observer pattern of software design patterns

ConsoleApplication4
...................\ConsoleApplication4
...................\...................\Cat.cs
...................\...................\ConsoleApplication4.csproj
...................\...................\Master.cs
...................\...................\Master2.cs
...................\...................\ModelBase.cs
...................\...................\Mouse.cs
...................\...................\Observer.cs
...................\...................\Observer2.cs
...................\...................\Program.cs
...................\...................\Properties
...................\...................\..........\AssemblyInfo.cs
...................\...................\bin
...................\...................\...\Debug
...................\...................\...\.....\ConsoleApplication4.exe
...................\...................\...\.....\ConsoleApplication4.pdb
...................\...................\...\.....\ConsoleApplication4.vshost.exe
...................\...................\...\Release
...................\...................\obj
...................\...................\...\Debug
...................\...................\...\.....\ConsoleApplication4.csproj.FileListAbsolute.txt
...................\...................\...\.....\ConsoleApplication4.csprojResolveAssemblyReference.cache
...................\...................\...\.....\ConsoleApplication4.exe
...................\...................\...\.....\ConsoleApplication4.pdb
...................\...................\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
...................\...................\...\.....\TempPE
...................\ConsoleApplication4.sln
...................\ConsoleApplication4.v12.suo
...................\WindowsFormsApplication1
...................\........................\Cat.cs
...................\........................\Form1.Designer.cs
...................\........................\Form1.cs
...................\........................\Form1.resx
...................\........................\Master.cs
...................\........................\Master2.cs
...................\........................\MiddleUser.cs
...................\........................\ModelBase.cs
...................\........................\Mouse.cs
...................\........................\Observer.cs
...................\........................\Observer2.cs
...................\........................\Program.cs
...................\........................\Properties
...................\........................\..........\AssemblyInfo.cs
...................\........................\..........\Resources.Designer.cs
...................\........................\..........\Resources.resx
...................\........................\..........\Settings.Designer.cs
...................\........................\..........\Settings.settings
...................\........................\SettingData.cs
...................\........................\UserControl1.Designer.cs
...................\........................\UserControl1.cs
...................\........................\WindowsFormsApplication1.csproj
...................\........................\bin
...................\........................\...\Debug
...................\........................\...\.....\WindowsFormsApplication1.vshost.exe
...................\........................\...\.....\WindowsFormsApplication1.vshost.exe.manifest
...................\........................\obj
...................\........................\...\Debug
...................\........................\...\.....\DesignTimeResolveAssemblyReferences.cache
...................\........................\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
...................\........................\...\.....\TempPE
...................\........................\...\.....\WindowsFormsApplication1.Form1.resources
...................\........................\...\.....\WindowsFormsApplication1.Properties.Resources.resources
...................\........................\...\.....\WindowsFormsApplication1.csproj.

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