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Please, consider adding an option to show the number of characters typed below the SfTextBox control, as shown here:

It's a very useful feature for users. It's not very hard to implement for me, but it adds quite a lot of html elements and styles around, so it's quite weird. Furthermore I need to call StateHasChanged() on every keypress so it triggers a rerender of the control context unnecesarily. I know I can wrap all this in a custom component but it seems more reasonable that you include this feature in your library.
Thanks and best regards