C# Windows Forms control to achieve hotkey hide show

C#窗体实现热键控制窗口隐藏显示
..............................\WebForm
..............................\.......\WebForm
..............................\.......\.......\IEcon.ico
..............................\.......\.......\Icon.ico
..............................\.......\.......\WebForm
..............................\.......\.......\.......\Form1.Designer.cs
..............................\.......\.......\.......\Form1.cs
..............................\.......\.......\.......\Form1.resx
..............................\.......\.......\.......\HotKey.cs
..............................\.......\.......\.......\Icon.ico
..............................\.......\.......\.......\Program.cs
..............................\.......\.......\.......\Properties
..............................\.......\.......\.......\..........\AssemblyInfo.cs
..............................\.......\.......\.......\..........\Resources.Designer.cs
..............................\.......\.......\.......\..........\Resources.resx
..............................\.......\.......\.......\..........\Settings.Designer.cs
..............................\.......\.......\.......\..........\Settings.settings
..............................\.......\.......\.......\Resources
..............................\.......\.......\.......\.........\未命名.jpg
..............................\.......\.......\.......\.........\未命名2.jpg
..............................\.......\.......\.......\.........\未命名21.jpg
..............................\.......\.......\.......\.........\未命名22.jpg
..............................\.......\.......\.......\WebForm.csproj
..............................\.......\.......\.......\bin
..............................\.......\.......\.......\...\Debug
..............................\.......\.......\.......\...\.....\WebForm.exe
..............................\.......\.......\.......\...\.....\WebForm.pdb
..............................\.......\.......\.......\...\.....\WebForm.vshost.exe
..............................\.......\.......\.......\...\.....\WebForm.vshost.exe.manifest
..............................\.......\.......\.......\obj
..............................\.......\.......\.......\...\Debug
..............................\.......\.......\.......\...\.....\Refactor
..............................\.......\.......\.......\...\.....\TempPE
..............................\.......\.......\.......\...\.....\......\Properties.Resources.Designer.cs.dll
..............................\.......\.......\.......\...\.....\WebForm.Form1.resources
..............................\.......\.......\.......\...\.....\WebForm.Properties.Resources.resources
..............................\.......\.......\.......\...\.....\WebForm.csproj.FileListAbsolute.txt
..............................\.......\.......\.......\...\.....\WebForm.csproj.GenerateResource.Cache
..............................\.......\.......\.......\...\.....\WebForm.exe
..............................\.......\.......\.......\...\.....\WebForm.pdb
..............................\.......\.......\WebForm.sln
..............................\.......\.......\WebForm.suo

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