he ref keyword causes an argument to be passed by reference, not by value. The effect of passing by reference is that any change to the parameter in the called method is reflected in the calling method

fsf-project on Visual Studio 2012 number 2\ConsoleApplication39\App.config
..........................................\....................\bin\Debug\ConsoleApplication39.exe
..........................................\....................\...\.....\ConsoleApplication39.exe.config
..........................................\....................\...\.....\ConsoleApplication39.pdb
..........................................\....................\...\.....\ConsoleApplication39.vshost.exe
..........................................\....................\...\.....\ConsoleApplication39.vshost.exe.config
..........................................\....................\...\.....\ConsoleApplication39.vshost.exe.manifest
..........................................\....................\ConsoleApplication39.csproj
..........................................\....................\obj\Debug\ConsoleApplication39.csproj.FileListAbsolute.txt
..........................................\....................\...\.....\ConsoleApplication39.csprojResolveAssemblyReference.cache
..........................................\....................\...\.....\ConsoleApplication39.exe
..........................................\....................\...\.....\ConsoleApplication39.pdb
..........................................\....................\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
..........................................\....................\...\.....\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs
..........................................\....................\...\.....\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs
..........................................\....................\...\.....\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs
..........................................\....................\Program.cs
..........................................\....................\...perties\AssemblyInfo.cs
..........................................\ConsoleApplication39.sln
..........................................\ConsoleApplication39.v11.suo
..........................................\....................\obj\Debug\TempPE
..........................................\....................\bin\Debug
..........................................\....................\obj\Debug
..........................................\....................\bin
..........................................\....................\obj
..........................................\....................\Properties
..........................................\ConsoleApplication39
fsf-project on Visual Studio 2012 number 2

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