Description: Implement the same interface with the user login function calculator: 1, the user is not logged in successfully, the calculator button on the control becomes gray. User logged in successfully before using the calculator 2, the user login verification code generated by the random number function 3, the calculator has data with the user login screen reset function.
File list (Check if you may need any files):
calculator-class
................\calculator-class
................\calculator-class.sln
................\calculator-class.suo
................\................\bin
................\................\...\Debug
................\................\...\.....\calculator-class.exe
................\................\...\.....\calculator-class.pdb
................\................\...\.....\calculator-class.vshost.exe
................\................\calculator-class.csproj
................\................\Form1.cs
................\................\Form1.Designer.cs
................\................\Form1.resx
................\................\obj
................\................\...\calculator-class.csproj.FileListAbsolute.txt
................\................\...\Debug
................\................\...\.....\calculator-class.csproj.GenerateResource.Cache
................\................\...\.....\calculator-class.exe
................\................\...\.....\calculator-class.pdb
................\................\...\.....\calculator_class.Form1.resources
................\................\...\.....\calculator_class.Properties.Resources.resources
................\................\...\.....\Refactor
................\................\...\.....\TempPE
................\................\Program.cs
................\................\Properties
................\................\..........\AssemblyInfo.cs
................\................\..........\Resources.Designer.cs
................\................\..........\Resources.resx
................\................\..........\Settings.Designer.cs
................\................\..........\Settings.settings
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