Best version of Bootstrap to use with ASP AJAX

Hi George,

You shouldn't experience problems in a Bootstrap 4 enabled aspx page.

The only known cosmetics appearance problems are that the RadWindow title and RadAsyncUpload are shrunk when placed in a Bootstrap enabled page due to that Bootstrap overrides their styles and applies box-sizing: border-box style, which you can fix by applying stronger selector with higher specificity like

<style>
.rwTitleWrapper { box-sizing: content-box !important; }
</style>

You can find more details at

https://www.telerik.com/support/kb/aspnet-ajax/details/fix-incorrect-appearance-in-telerik-controls-when-using-bootstrap-library.

As for Bootstrap v5, I am not aware of known appearance issues so far.

Regards,
Rumen
Progress Telerik