c#写的计算器（加减乘除）

E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\ResolveAssemblyReference.cache E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Form1.resources E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Properties.Resources.resources E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource.read.1.tlog E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\GenerateResource.write.1.tlog E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.exe E:\VS_project\WindowsFormsApplication1\WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.pdb