Realized in the form of small balls move, when the ball hit the edge of the form is set up in accordance with the direction of ray paths in timer to control the ball position x, y changes, very simple, do not spray the great God!

WindowsFormsApplication6
........................\WindowsFormsApplication6
........................\WindowsFormsApplication6.sln
........................\WindowsFormsApplication6.suo
........................\........................\bin
........................\........................\...\Debug
........................\........................\...\.....\WindowsFormsApplication6.exe
........................\........................\...\.....\WindowsFormsApplication6.pdb
........................\........................\...\.....\WindowsFormsApplication6.vshost.exe
........................\........................\...\.....\WindowsFormsApplication6.vshost.exe.manifest
........................\........................\Form1.cs
........................\........................\Form1.Designer.cs
........................\........................\Form1.resx
........................\........................\obj
........................\........................\...\x86
........................\........................\...\...\Debug
........................\........................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
........................\........................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
........................\........................\...\...\.....\TempPE
........................\........................\...\...\.....\WindowsFormsApplication6.csproj.FileListAbsolute.txt
........................\........................\...\...\.....\WindowsFormsApplication6.csproj.GenerateResource.Cache
........................\........................\...\...\.....\WindowsFormsApplication6.csprojResolveAssemblyReference.cache
........................\........................\...\...\.....\WindowsFormsApplication6.exe
........................\........................\...\...\.....\WindowsFormsApplication6.Form1.resources
........................\........................\...\...\.....\WindowsFormsApplication6.pdb
........................\........................\...\...\.....\WindowsFormsApplication6.Properties.Resources.resources
........................\........................\Program.cs
........................\........................\Properties
........................\........................\..........\AssemblyInfo.cs
........................\........................\..........\Resources.Designer.cs
........................\........................\..........\Resources.resx
........................\........................\..........\Settings.Designer.cs
........................\........................\..........\Settings.settings
........................\........................\WindowsFormsApplication6.csproj

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