public class Bookmark :
    DocumentElementBase,
    IIndexBasedTransactionalObject,
    ITransactableObject

<DxRichEdit @ref="@richEdit" />

@code {
    DxRichEdit richEdit { get; set; }
    @* ... *@
    /* Surround the code that contains an asynchronous operation with a try-catch block to handle
    the OperationCanceledException. This exception is thrown when an asynchronous operation is canceled. */
        try {
        @* ... *@
            // Create a bookmark
            var bookmarkTextSpan = await richEdit.DocumentAPI.AddTextAsync("Chapter 1");
            var bookmarkChapter1 = await richEdit.DocumentAPI.Bookmarks.CreateAsync(bookmarkTextSpan.Interval, "chapter1Bookmark");
            @* ... *@
        }
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
}

// Create a hyperlink to the bookmark
var hlChapter1Span = await richEdit.DocumentAPI.AddTextAsync("To learn more, see the Chapter 1");
await richEdit.DocumentAPI.Hyperlinks.CreateAsync(hlChapter1Span.Interval, "", bookmarkChapter1.Name, "Go to Chapter 1");