How to address a user in an email?

We would like to send users of our service an email after they have availed our service. We get the bookings through online website or through offline medium. We have the users name ( just first name or full name) and the email. But, we wo…
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What are best practices for blocking UI when application is busy

I’m writing a web app using Twitter Bootstrap with PHP on server side.
My app makes regular ajax requests via jQuery and i want to disable certain parts of the UI until the server completes processing and hands back the control to Client-S…