There are two functions similar to the example, the first to use the WebClient implementation, a WebRequest class and WebResponse classes with the realization. Explain two examples of when to pay attention to the WebRequest class and WebResponse classes are abstract classes.

2、访问Internet\2.1 WebClient类\2.1 WebClient类.csproj
...............\...............\2.1 WebClient类.csproj.user
...............\...............\App.ico
...............\...............\AssemblyInfo.cs
...............\...............\bin\Debug\AxInterop.SHDocVw.dll
...............\...............\...\.....\Interop.SHDocVw.dll
...............\...............\...\.....\WebClient类.exe
...............\...............\...\.....\WebClient类.pdb
...............\...............\Form1.cs
...............\...............\Form1.resx
...............\...............\obj\AxInterop.SHDocVw.dll
...............\...............\...\Debug\2.1 WebClient类.projdata
...............\...............\...\.....\WebClient类.exe
...............\...............\...\.....\WebClient类.Form1.resources
...............\...............\...\.....\WebClient类.pdb
...............\...............\...\.....\WebClient类.projdata
...............\...............\...\Interop.SHDocVw.dll
...............\..2 WebRequest类和WebResponse类\2.2 WebRequest类和WebResponse类.csproj
...............\...............................\2.2 WebRequest类和WebResponse类.csproj.user
...............\...............................\App.ico
...............\...............................\AssemblyInfo.cs
...............\...............................\bin\Debug\AxInterop.SHDocVw.dll
...............\...............................\...\.....\Interop.SHDocVw.dll
...............\...............................\...\.....\WebRequest类和WebResponse类.exe
...............\...............................\...\.....\WebRequest类和WebResponse类.pdb
...............\...............................\Form1.cs
...............\...............................\Form1.resx
...............\...............................\obj\AxInterop.SHDocVw.dll
...............\...............................\...\Debug\2.2 WebRequest类和WebResponse类.projdata
...............\...............................\...\.....\WebClient类.Form1.resources
...............\...............................\...\.....\WebRequest类和WebResponse类.exe
...............\...............................\...\.....\WebRequest类和WebResponse类.pdb
...............\...............................\...\.....\WebRequest类和WebResponse类.projdata
...............\...............................\...\Interop.SHDocVw.dll
...............\2、访问Internet.sln
...............\2、访问Internet.suo
...............\Readme.txt
...............\2.1 WebClient类\obj\Debug\temp
...............\...............\...\.....\TempPE
...............\..2 WebRequest类和WebResponse类\obj\Debug\temp
...............\...............................\...\.....\TempPE
...............\..1 WebClient类\bin\Debug
...............\...............\obj\Debug
...............\..2 WebRequest类和WebResponse类\bin\Debug
...............\...............................\obj\Debug
...............\..1 WebClient类\bin
...............\...............\obj
...............\..2 WebRequest类和WebResponse类\bin
...............\...............................\obj
...............\2.1 WebClient类
...............\2.2 WebRequest类和WebResponse类
2、访问Internet

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