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hello
I want a way to make alarm message for some event such as expire date in records , and this alarm appear in list page when date been expire.
I hope to get some help please
thanks

You can use the Page_* server events to set warning message to the page. For example:

WarningMessage = "my warning message";

Read:
https://aspnetmaker.dev/docs/#/customsc ... ver-events

So is there any way to put these messages in inbox to read them later for v21?

Explain what you mean by "inbox".

I meant every warning messages will be in notification box to show each of these messages when open this book.

Check out Tools -> Advanced Settings -> Use Bootstrap Toast message.