You posted a question without any code, so I’ll answer without code too.

• In your HandleValidSubmit() method, store the message somewhere, like in a SortedList<DateTime, string>

• Make sure the next-up item is always easily available , in _next.

• in override OnInitialized(), create a System.Timers.Timer. An interval of 1 – 30 seconds seems appropriate.

• in the Elapsed event:

  • if (_next.Key <= DateTime.Now) // showtime

    • update the UI elements
    • update _next
    • call InvokeAsync(StateHasChanged);

I try to make a project in Visual Studio 2019 (Blazor Webassembly), the project is like when i insert a text and choose a specific time (it can be different any time) and at last choose the date then show me that text as i wrote.

For example here in the pic 2 i insert Some Text in the text area and choose 07:10 as time and the date of today, consider now is 07:08 the message should display two minutes later.

Thank you in advance.

Pic 1

Pic 2

Pic 3