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Add Excel comment in C#, VB.NET

Platform: WinForms |
Control: XlsIO

Syncfusion Excel (XlsIO) library is a .NET Excel library used to create, read, and edit Excel documents. Also, converts Excel documents to PDF files. Using this library, you can add Excel comment in C#, VB.NET.

What is the use of Excel comment?

Excel comments are used to add notes to individual cells which explain the contents or offer tips to users. When a cell has a comment, a red triangle indicator appears in the upper-right corner of the cell. When you rest the pointer on the cell, the comment appears.

Steps to add Excel comment in C#, VB.NET, programmatically:

Step 1: Create a new C# console application project.

Create C# Console Application

Create a new C# console application

Step 2: Install the Syncfusion.XlsIO.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.

Install NuGet Package

Install NuGet package

Step 3: Include the following namespace in the Program.cs file.


using Syncfusion.XlsIO;



Imports Syncfusion.XlsIO


Step 4: Use the following code snippet to add Excel comment in C#, VB.NET.


using (ExcelEngine excelEngine = new ExcelEngine())
    //Instantiate the Excel application object
    IApplication application = excelEngine.Excel;
    //Add a workbook
    IWorkbook workbook = application.Workbooks.Create(1);
    //The first worksheet object in the worksheets collection is accessed
    IWorksheet worksheet = workbook.Worksheets[0];
    //Add cell texts
    worksheet.Range["A1"].Text = "Cell containing regular Excel comment";
    worksheet.Range["A3"].Text = "Cell containing rich-text Excel comment";
    //Add regular Excel comment
    worksheet.Range["A1"].AddComment().Text = "Regular Excel comment";
    //Add rich-text Excel comment
    IRange range = worksheet.Range["A3"];
    range.AddComment().RichText.Text = "Excel comment with Rich-Text";
    IRichTextString rtf = range.Comment.RichText;
    IFont font = workbook.CreateFont();
    font.Bold = true;
    font.Italic = true;
    rtf.SetFont(0, 4, font);
    //Save the workbook



Using excelEngine As ExcelEngine = New ExcelEngine()
    ' Instantiate the Excel application object
    Dim application As IApplication = excelEngine.Excel
    ' Add a workbook
    Dim workbook As IWorkbook = application.Workbooks.Create(1)
    'The first worksheet object in the worksheets collection is accessed
    Dim worksheet As IWorksheet = workbook.Worksheets(0)
    'Add cell texts
    worksheet.Range("A1").Text = "Cell containing regular Excel comment"
    worksheet.Range("A3").Text = "Cell containing rich-text Excel comment"
    'Add regular Excel comment
    worksheet.Range("A1").AddComment().Text = "Regular Excel comment"
    'Add rich-text Excel comment
    Dim range As IRange = worksheet.Range("A3")
    range.AddComment().RichText.Text = "Excel comment with Rich-Text"
    Dim rtf As IRichTextString = range.Comment.RichText
    Dim font As IFont = workbook.CreateFont()
    font.Bold = True
    font.Italic = True
    rtf.SetFont(0, 4, font)
    'Save the workbook
End Using


A complete Windows Forms working example of how to add Excel comment in C#, VB.NET can be downloaded from Add Excel Comment.zip.

By executing the program, you will get the output Excel document as shown below.

Output after adding Excel comment

Output Excel document

Refer here to explore the rich set of Syncfusion Excel (XlsIO) library features.

See Also:

How to set RTF text to cell comment using XlsIO?

How to format comments in a cell using XlsIO

How to resize comment box using C#,VB.NET?

Create Excel comment with background image in C#, VB.NET

How to add text box shape in Excel charts?


Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer the link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.


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