Task chaining (wait for the previous task to completed)

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This is not Task Chaining.

You need to do Task chaining using ContinueWith. Last task would need to update the UI.

Task.Factory.StartNew( () => DoThis())
   .ContinueWith((t1) => DoThat())
   .ContinueWith((t2) => UpdateUi(), 
       TaskScheduler.FromCurrentSynchronizationContext());

Note the last line has TaskScheduler.FromCurrentSynchronizationContext() this will ensure task will run in the synchronization context (UI Thread).

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