Learning new calculator source C#, very easy to use Notes in place

Calc
....\WindowsApplication3
....\WindowsApplication3.suo
....\...................\bin
....\...................\...\Debug
....\...................\...\.....\Calculator.exe
....\...................\...\.....\Calculator.pdb
....\...................\...\.....\Calculator.vshost.exe
....\...................\Calc图标.ico
....\...................\Form1.cs
....\...................\Form1.Designer.cs
....\...................\Form1.resx
....\...................\obj
....\...................\...\Debug
....\...................\...\.....\Calculator.exe
....\...................\...\.....\Calculator.pdb
....\...................\...\.....\Jason.Properties.Resources.resources
....\...................\...\.....\TempPE
....\...................\...\.....\......\Properties.Resources.Designer.cs.dll
....\...................\...\.....\WindowsApplication3.csproj.GenerateResource.Cache
....\...................\...\.....\WindowsApplication3.Form1.resources
....\...................\...\.....\WindowsApplication3.Properties.Resources.resources
....\...................\...\WindowsApplication3.csproj.FileList.txt
....\...................\Program.cs
....\...................\Properties
....\...................\..........\app.manifest
....\...................\..........\AssemblyInfo.cs
....\...................\..........\Resources.Designer.cs
....\...................\..........\Resources.resx
....\...................\..........\Settings.Designer.cs
....\...................\..........\Settings.settings
....\...................\WindowsApplication3.csproj
....\...................\WindowsApplication3.csproj.user
....\WindowsApplication4.sln
....\WindowsApplication4.suo

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