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How do I get a Web form dropdown to refresh after a pop-up window is closed?

I have a Web form with a dropdown in which users choose their alias. This drop-down is linked to a SQL Server table. If the user doesn't have an alias, they can click a button and a pop-up window appears in which they add their name and alias. This pop-up updates the SQL Server table. How do I get the drop-down to refresh after they have closed the pop-up and returned to the main Web form?
You would have to reload the main page. This involves the following call in JavaScript from within your popup window, before closing it:

self.opener.location.reload();

Note that self.opener, window.opener, and simply opener point to the same object.

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