c# to achieve the simple windows calculator, including the addition and subtraction multiplication and division functions, suitable for beginners c#, code that is clear and clearly Notes

OperationTest
.............\OperationTest
.............\.............\bin
.............\.............\...\Debug
.............\.............\...\.....\OperationTest.exe
.............\.............\...\.....\OperationTest.pdb
.............\.............\...\.....\OperationTest.vshost.exe
.............\.............\...\.....\OperationTest.vshost.exe.manifest
.............\.............\Form1.cs
.............\.............\Form1.Designer.cs
.............\.............\Form1.resx
.............\.............\obj
.............\.............\...\Debug
.............\.............\...\.....\OperationTest.csproj.FileListAbsolute.txt
.............\.............\...\.....\OperationTest.csproj.GenerateResource.Cache
.............\.............\...\.....\OperationTest.exe
.............\.............\...\.....\OperationTest.Form1.resources
.............\.............\...\.....\OperationTest.pdb
.............\.............\...\.....\OperationTest.Properties.Resources.resources
.............\.............\...\.....\Refactor
.............\.............\...\.....\TempPE
.............\.............\OperationTest.csproj
.............\.............\Program.cs
.............\.............\Properties
.............\.............\..........\AssemblyInfo.cs
.............\.............\..........\Resources.Designer.cs
.............\.............\..........\Resources.resx
.............\.............\..........\Settings.Designer.cs
.............\.............\..........\Settings.settings
.............\OperationTest.sln

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