我可以“取消”在更新面板中发生的长时间运行的进程吗？

I have an updatepanel that contains a dropdown that once the page has finished loading that will go and populate the dropdown with the latest data. The data grab can take up to 3 minutes. Can I opt for the user to "cancel" the request and just use the last version of the data?I have an updatepanel that contains a dropdown