Description: Using C# to write a timer (countdown), you can the type of time (seconds, minutes, hours) in time ends messagebox will pop up prompt.
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File list (Check if you may need any files):
计时器
......\Form1.Designer.cs
......\Form1.cs
......\Form1.resx
......\Program.cs
......\Properties
......\..........\AssemblyInfo.cs
......\..........\Resources.Designer.cs
......\..........\Resources.resx
......\..........\Settings.Designer.cs
......\..........\Settings.settings
......\bin
......\...\Debug
......\...\.....\计时器.exe
......\...\.....\计时器.pdb
......\...\.....\计时器.vshost.exe
......\...\.....\计时器.vshost.exe.manifest
......\obj
......\...\Debug
......\...\.....\DesignTimeResolveAssemblyReferences.cache
......\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
......\...\.....\TempPE
......\...\.....\计时器.Form1.resources
......\...\.....\计时器.Properties.Resources.resources
......\...\.....\计时器.csproj.FileListAbsolute.txt
......\...\.....\计时器.csproj.GenerateResource.Cache
......\...\.....\计时器.exe
......\...\.....\计时器.pdb
......\计时器.csproj