Calculate the exponent power of 3 numbers, turn on a subroutine, and prevent the program crashing

BigAccount\BigAccount\app.config
..........\..........\BigAccount.csproj
..........\..........\BigAccount.csproj.user
..........\..........\bin\Debug\BigAccount.exe
..........\..........\...\.....\BigAccount.exe.config
..........\..........\...\.....\BigAccount.pdb
..........\..........\...\.....\BigAccount.vshost.exe
..........\..........\...\.....\BigAccount.vshost.exe.config
..........\..........\...\.....\BigAccount.vshost.exe.manifest
..........\..........\Frm_Main.cs
..........\..........\Frm_Main.Designer.cs
..........\..........\Frm_Main.resx
..........\..........\obj\Debug\BigAccount.csproj.FileListAbsolute.txt
..........\..........\...\.....\BigAccount.csproj.GenerateResource.Cache
..........\..........\...\.....\BigAccount.exe
..........\..........\...\.....\BigAccount.Form1.resources
..........\..........\...\.....\BigAccount.Frm_Main.resources
..........\..........\...\.....\BigAccount.pdb
..........\..........\...\.....\BigAccount.Properties.Resources.resources
..........\..........\...\.....\DesignTimeResolveAssemblyReferences.cache
..........\..........\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..........\..........\...\.....\GenerateResource.read.1.tlog
..........\..........\...\.....\GenerateResource.write.1.tlog
..........\..........\...\.....\TempPE\Properties.Resources.Designer.cs.dll
..........\..........\Program.cs
..........\..........\...perties\AssemblyInfo.cs
..........\..........\..........\Resources.Designer.cs
..........\..........\..........\Resources.resx
..........\..........\..........\Settings.Designer.cs
..........\..........\..........\Settings.settings
..........\BigAccount.sln
..........\BigAccount.suo
..........\..........\obj\Debug\TempPE
..........\..........\bin\Debug
..........\..........\...\Release
..........\..........\obj\Debug
..........\..........\bin
..........\..........\obj
..........\..........\Properties
..........\BigAccount
BigAccount

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