you can use power shell to delete all files.

删除指定文件夹指定日期期间的文件
................................\删除指定文件夹指定日期期间的文件
................................\删除指定文件夹指定日期期间的文件.sln
................................\删除指定文件夹指定日期期间的文件.v11.suo
................................\................................\App.config
................................\................................\bin
................................\................................\...\Debug
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.exe
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.exe.config
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.pdb
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.vshost.exe
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.vshost.exe.config
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.vshost.exe.manifest
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.xml
................................\................................\Form1.Designer.vb
................................\................................\Form1.resx
................................\................................\Form1.vb
................................\................................\My Project
................................\................................\..........\Application.Designer.vb
................................\................................\..........\Application.myapp
................................\................................\..........\AssemblyInfo.vb
................................\................................\..........\Resources.Designer.vb
................................\................................\..........\Resources.resx
................................\................................\..........\Settings.Designer.vb
................................\................................\..........\Settings.settings
................................\................................\obj
................................\................................\...\Debug
................................\................................\...\.....\DesignTimeResolveAssemblyReferences.cache
................................\................................\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
................................\................................\...\.....\TempPE
................................\................................\...\.....\......\My Project.Resources.Designer.vb.dll
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.exe
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.Form1.resources
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.pdb
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.Resources.resources
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.vbproj.FileListAbsolute.txt
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.vbproj.GenerateResource.Cache
................................\................................\...\.....\删除指定文件夹指定日期期间的文件.xml
................................\................................\删除指定文件夹指定日期期间的文件.vbproj

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