Document document = server.Document;
document.LoadDocument("Documents\\Grimm.docx", DocumentFormat.Docx);
int commentCount = document.Comments.Count;
if (commentCount > 0)
{
    document.BeginUpdate();
    Comment comment = document.Comments[document.Comments.Count - 1];
    comment.Name = "New Name";
    comment.Date = DateTime.Now;
    comment.Author = "New Author";
    document.EndUpdate();
}

Dim document As Document = server.Document
document.LoadDocument("Documents\Grimm.docx", DocumentFormat.Docx)
Dim commentCount As Integer = document.Comments.Count
If commentCount > 0 Then
    document.BeginUpdate()
    Dim comment As Comment = document.Comments(document.Comments.Count - 1)
    comment.Name = "New Name"
    comment.Date = Date.Now
    comment.Author = "New Author"
    document.EndUpdate()
End If

winforms-richedit-document-api/CS/RichEditAPISample/CodeExamples/Comments.cs#L25

    Comment newComment = document.Comments.Create("Vicars Anny", document.Comments[1]);
    newComment.Date = DateTime.Now;
}

wpf-richedit-document-api/CS/DXRichEditControlAPISample/CodeExamples/CommentsActions.cs#L33

    Comment newComment = document.Comments.Create("Vicars Anny", document.Comments[1]);
    newComment.Date = DateTime.Now;
}

word-document-api-examples/CS/CodeExamples/CommentsActions.cs#L56

Comment newComment = document.Comments.Create("Vicars Anny", document.Comments[1]);
newComment.Date = DateTime.Now;
SubDocument commentDocument = newComment.BeginUpdate();

winforms-richedit-document-api/VB/RichEditAPISample/CodeExamples/Comments.vb#L24

    Dim newComment As DevExpress.XtraRichEdit.API.Native.Comment = document.Comments.Create("Vicars Anny", document.Comments(1))
    newComment.[Date] = System.DateTime.Now
End If

wpf-richedit-document-api/VB/DXRichEditControlAPISample/CodeExamples/CommentsActions.vb#L31

    Dim newComment As Comment = document.Comments.Create("Vicars Anny", document.Comments(1))
    newComment.Date = DateTime.Now
End If

word-document-api-examples/VB/CodeExamples/CommentsActions.vb#L50

Dim newComment As DevExpress.XtraRichEdit.API.Native.Comment = document.Comments.Create("Vicars Anny", document.Comments(1))
newComment.[Date] = System.DateTime.Now
Dim commentDocument As SubDocument = newComment.BeginUpdate()