Please note that RadWindow's radalert, radprompt, radconfirm functions cannot
block the execution thread and can exist only in the page from which
they were created - that is why you don't see the alert dialog before redirecting to another URL. One suggestion is you can display the RadAlert from server side code and you can redirect to another URL using the client side code so that redirection happens only after displaying the RadAlert. Please have a look at the following code I tried which works fine at my end.
sender, EventArgs e)
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