Aspose.Cells  for .NET

Insert comments in XLSX file via C#

Build your own .NET application to manipulate comments & authors in document files using server-side APIs.

Insert comments in XLSX File Using .NET

With Aspose.Cells for .NET library, you can easily insert comments in XLSX file programmatically with a few lines of code. Aspose.Cells for .NET is capable of building cross-platform applications with the ability to generate, modify, convert, render and print all Excel files. .NET Excel API not only convert between spreadsheet formats, it can also render Excel files as images, PDF, HTML, ODS, CSV, SVG, JSON, WORD, PPT and more, thus making it a perfect choice to exchange documents in industry-standard formats. Open NuGet package manager, search for Aspose.Cells and install. You may also use the following command from the Package Manager Console.

Package Manager Console Command

PM> Install-Package Aspose.Cells

System Requirements

Aspose.Cells for .NET is supported on all major operating systems. Just make sure that you have the following prerequisites.

  • Microsoft Windows or a compatible OS with .NET, .NET Core or Mono Platforms.
  • Development environment like Microsoft Visual Studio.
  • Our product is fully cross-platform and supports Windows, Linux, MacOS, Azure, AWS Lambda.

How to insert comments in XLSX file via C#

You need aspose.cells.dll to try the code in your environment.

  • Load XLSX file by creating an instance of Workbook
  • Insert comments to the Worksheet in a Cell
  • Save the workbook

In Office 365, comments are for conversations, you can use the following C# code to insert and remove comments in XLSX file.


C# sample code to Insert and remove comments in XLSX file

Free App to remove Annotations from XLSX file
Input file
  using Aspose.Cells;   
  var workbook = new Workbook("Input.xlsx");
  foreach (Worksheet _ws in workbook.Worksheets)

XLSX What is XLSX File Format

XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007. Based on structure organized according to the Open Packaging Conventions as outlined in Part 2 of the OOXML standard ECMA-376, the new format is a zip package that contains a number of XML files. The underlying structure and files can be examined by simply unzipping the .xlsx file.

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Insert Comments to Other Supported Excel Formats

Using C#, one can easily insert comments in other Excel format files.

ODS (OpenDocument Spreadsheet File)
XLS (Excel Binary Format)
XLSB (Binary Excel Workbook File)
XLSM (Spreadsheet File)
XLSX (OOXML Excel File)