What does plus equals(+=) operator means here?
c#, windows-phone
Solution
In the current context `+=` means `subscribe`. In other words it's like you are telling `subscribe my method (the right operand) to this event (the left operand)`, this way, when the event is raised, your method will be called. Also, it is a good practice to `unsubscribe` (`-=` from this event, when you have finished your work ( but before you dispose you object ) in order to prevent your method being called and to prevent resource leaks. FMI look here.
Problem
I was working out sample code of Windows phone and often I see statements with `+=` operator. I know about add assignment operator which does the below operation ``` += means a = a + b; // used for both adding number and string concatenation ``` But this is new to me ``` phNumChoseTask = new PhoneNumberChooserTask(); phNumChoseTask.Completed += new EventHandler<PhoneNumberResult>(phoneNumberChooserTask_Completed); ``` Here how does `+=` works?