C# programming to achieve the reading and writing of MS Excel 2007 form, the file that read and write XLSX format, the function is completed successfully, but there is one error that does not affect the use.

............\Excel2007ReadWrite
............\..................\bin
............\..................\...\Debug
............\..................\...\.....\Excel2007ReadWrite.exe
............\..................\...\.....\Excel2007ReadWrite.pdb
............\..................\...\.....\Excel2007ReadWrite.vshost.exe
............\..................\...\.....\ICSharpCode.SharpZipLib.dll
............\..................\...\Release
............\..................\...\.......\Excel2007ReadWrite.exe
............\..................\...\.......\ICSharpCode.SharpZipLib.dll
............\..................\DLLs
............\..................\....\ICSharpCode.SharpZipLib.dll
............\..................\Excel2007ReadWrite.csproj
............\..................\Excel2007ReadWrite.sln
............\..................\ExcelRW.cs
............\..................\ExcelRWForm.cs
............\..................\ExcelRWForm.Designer.cs
............\..................\ExcelRWForm.resx
............\..................\Input
............\..................\.....\In.xlsx
............\..................\obj
............\..................\...\Debug
............\..................\...\.....\Excel2007ReadWrite.csproj.GenerateResource.Cache
............\..................\...\.....\Excel2007ReadWrite.ExcelRWForm.resources
............\..................\...\.....\Excel2007ReadWrite.exe
............\..................\...\.....\Excel2007ReadWrite.pdb
............\..................\...\.....\Excel2007ReadWrite.Properties.Resources.resources
............\..................\...\.....\ResolveAssemblyReference.cache
............\..................\...\.....\TempPE
............\..................\...\Excel2007ReadWrite.csproj.FileList.txt
............\..................\Output
............\..................\......\Out.xlsx
............\..................\Program.cs
............\..................\Properties
............\..................\..........\AssemblyInfo.cs
............\..................\..........\Resources.Designer.cs
............\..................\..........\Resources.resx
............\..................\..........\Settings.Designer.cs
............\..................\..........\Settings.settings
............\..................\TEMP
............\..................\....\docProps
............\..................\....\........\app.xml
............\..................\....\........\core.xml
............\..................\....\xl
............\..................\....\..\sharedStrings.xml
............\..................\....\..\styles.xml
............\..................\....\..\theme
............\..................\....\..\.....\theme1.xml
............\..................\....\..\workbook.xml
............\..................\....\..\worksheets
............\..................\....\..\..........\sheet1.xml
............\..................\....\..\..........\sheet2.xml
............\..................\....\..\..........\sheet3.xml
............\..................\....\..\_rels
............\..................\....\..\.....\workbook.xml.rels
............\..................\....\[Content_Types].xml
............\..................\....\_rels
............\..................\....\.....\.rels
............\..................\Template.xlsx

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