C# file read and write, use the FileStream class to read the file, use the StreamWriter to write the file data, and then use the StreamReader to read the file, line by line output.

file_ReadWriteTest\file_ReadWriteTest\bin\Debug\file_ReadWriteTest.exe
..................\..................\...\.....\file_ReadWriteTest.pdb
..................\..................\...\.....\file_ReadWriteTest.vshost.exe
..................\..................\...\.....\file_ReadWriteTest.vshost.exe.manifest
..................\..................\file_ReadWriteTest.csproj
..................\..................\Form1.cs
..................\..................\Form1.Designer.cs
..................\..................\Form1.resx
..................\..................\obj\Debug\file_ReadWriteTest.csproj.FileListAbsolute.txt
..................\..................\...\.....\file_ReadWriteTest.csproj.GenerateResource.Cache
..................\..................\...\.....\file_ReadWriteTest.exe
..................\..................\...\.....\file_ReadWriteTest.Form1.resources
..................\..................\...\.....\file_ReadWriteTest.pdb
..................\..................\...\.....\file_ReadWriteTest.Properties.Resources.resources
..................\..................\Program.cs
..................\..................\...perties\AssemblyInfo.cs
..................\..................\..........\Resources.Designer.cs
..................\..................\..........\Resources.resx
..................\..................\..........\Settings.Designer.cs
..................\..................\..........\Settings.settings
..................\file_ReadWriteTest.sln
..................\file_ReadWriteTest.suo
..................\..................\obj\Debug\Refactor
..................\..................\...\.....\TempPE
..................\..................\bin\Debug
..................\..................\obj\Debug
..................\..................\bin
..................\..................\obj
..................\..................\Properties
..................\file_ReadWriteTest
file_ReadWriteTest

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