AngularJs MVC Framework Tutorial 101. Mailbox Application. Part 1

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Hello I followed your tutorials from screencast and on part 29 your respond functionality doesn't work. It respond from current user logged to the Receiver, where they are the same user. I tried to create a controller "MessageRespond" where I tried to make the sender to be the receiver by messageId but it doesn't work at all, any thoughts how I can deal with this?