about base classes in csharp

umair\first\first\bin\Debug\first.exe
.....\.....\.....\...\.....\first.pdb
.....\.....\.....\...\.....\first.vshost.exe
.....\.....\.....\...\.....\first.vshost.exe.manifest
.....\.....\.....\...\Debug
.....\.....\.....\bin
.....\.....\.....\first.csproj
.....\.....\.....\Form1.cs
.....\.....\.....\Form1.Designer.cs
.....\.....\.....\Form1.resx
.....\.....\.....\obj\Debug\first.csproj.FileListAbsolute.txt
.....\.....\.....\...\.....\first.csproj.GenerateResource.Cache
.....\.....\.....\...\.....\first.exe
.....\.....\.....\...\.....\first.Form1.resources
.....\.....\.....\...\.....\first.pdb
.....\.....\.....\...\.....\first.Properties.Resources.resources
.....\.....\.....\...\.....\TempPE
.....\.....\.....\...\Debug
.....\.....\.....\obj
.....\.....\.....\Program.cs
.....\.....\.....\...perties\AssemblyInfo.cs
.....\.....\.....\..........\Resources.Designer.cs
.....\.....\.....\..........\Resources.resx
.....\.....\.....\..........\Settings.Designer.cs
.....\.....\.....\..........\Settings.settings
.....\.....\.....\Properties
.....\.....\first
.....\.....\first.sln
.....\.....\first.suo
.....\first
.....\search.ldb
.....\search.mdb
umair

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