public ValueTask RemoveAsync(
    int index,
    CancellationToken cancellationToken = default(CancellationToken)
)

<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 {
            var bookmarks = await richEdit.DocumentAPI.Bookmarks.GetAllAsync();
            // Remove all bookmarks from the document
            while (bookmarks.Count > 0) {
                await richEdit.DocumentAPI.Bookmarks.RemoveAsync(0);
                bookmarks = await richEdit.DocumentAPI.Bookmarks.GetAllAsync();
            }
        }
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");
        }
}