When commissioned in learning to use the message box to entrust the realization of output, since I am beginning to repeat there is no talent so the code quality may fail, please understand

DelegateTest
............\DelegateTest
............\............\bin
............\............\...\Debug
............\............\ClassTeacher.cs
............\............\Delegate.cs
............\............\DelegateTest.csproj
............\............\GlassMaster.cs
............\............\obj
............\............\...\Debug
............\............\...\DelegateTest.csproj.FileList.txt
............\DelegateTest.sln

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