I want to input text in one TextBox and as soon as I finish my input, it should do some background work and show the results on the other TextBox. I do not want to use any 'button', 'enter', 'tab' or any other triggering mechanism. The end of input in the first TextBox should be the only trigger! Please help.

How do you define when you are finished your input? Event based programming relies on triggers to do anything. In your case the trigger is end-of-input. But you have to define what that is.

perhaps lostfocus or keypress event. when you reach the specific character length it shall call a function.

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