Add Comments in Excel

8 Dec 20233 minutes to read

You can add comments in Excel to give feedback about the content of a cell. A red triangle in the upper-right corner of a cell indicates comment. By default, a comment can be seen only when you hover over the cell that contains the comment.

The following code shows how to add a comment with text to a cell using Interop and XlsIO for .NET.

Interop

C#

private void AddComment()
{
  //Instantiate the application object
  var excelApp = new Microsoft.Office.Interop.Excel.Application();

  //Add a workbook
  Workbook workbook = excelApp.Workbooks.Add(System.Reflection.Missing.Value);

  //Get the A1 cell
  Range rng1 = excelApp.get_Range("A1", Missing.Value);

  //Add the comment with text
  rng1.AddComment("This is my comment");

  //Save the file
  workbook.SaveAs("InteropOutput_AddComment.xlsx");

  //Quit the application
  excelApp.Quit();
}

VB.NET

Private Sub AddComment()
  'Instantiate the application object
  Dim excelApp = New Microsoft.Office.Interop.Excel.Application()

  'Add a workbook
  Dim workbook As Workbook = excelApp.Workbooks.Add(System.Reflection.Missing.Value)

  'Get the A1 cell
  Dim rng1 As Range = excelApp.Range("A1")

  'Add the comment with text
  rng1.AddComment("This is my comment")

  'Save the file
  workbook.SaveCopyAs("InteropOutput_AddComment.xlsx")

  'Quit the application
  excelApp.Quit()
End Sub

XlsIO

C#

private void AddComment()
{
  using (ExcelEngine excelEngine = new ExcelEngine())
  {
    //Instantiate the application object
    IApplication application = excelEngine.Excel;

    //Create a workbook
    IWorkbook workbook = application.Workbooks.Create(1);
    IWorksheet worksheet = workbook.Worksheets[0];

    //Add comments to a cell
    IComment comment = worksheet.Range["A1"].AddComment();
    comment.Text = "This is my comment";

    //Save the workbook
    workbook.SaveAs("XlsIOOutput_AddComment.xlsx");
  }
}

VB.NET

Private Sub AddComment()
  Using excelEngine As ExcelEngine = New ExcelEngine()
    'Instantiate the application object
    Dim application As IApplication = excelEngine.Excel

    'Create a workbook
    Dim workbook As IWorkbook = application.Workbooks.Create(1)
    Dim worksheet As IWorksheet = workbook.Worksheets(0)

    'Add comments to a cell
    Dim comment As IComment = worksheet.Range("A1").AddComment()
    comment.Text = "This is my comment"

    'Save as Excel file
    workbook.SaveAs("XlsIOOutput_AddComment.xlsx")
  End Using
End Sub