Button is not working inside update panel

this may help you

https://www.syncfusion.com/forums/119025/add-asyncpostbacktrigger-on-updatepanel-for-button-inside-the-ribbon

https://forums.asp.net/t/2071469.aspx?button+inside+updatepanel+is+not+firing

https://www.codeproject.com/Questions/272796/Button-is-not-workingwith-Update-Panel-in-asp-net

https://www.dnnsoftware.com/forums/threadid/301749/scope/posts/submit-button-inside-an-update-panel-is-not-working-properly

https://www.c-sharpcorner.com/forums/button-event-not-firing-in-updatepanel