What is the use of ConvertBack method in IValueConverter interface?

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What is the use of ConvertBack method in the IValueConverter interface.

When will it be called?

Or what is the order of invocation of the Convert and ConvertBack methods?

I have asked the question here because: I have bound one property of codebehind to TEXTBOX’s TEXT Property and am using convertor for that property. The first Convert Method invokes and when I change TEXT in TEXTBOX nothing happens... but as soon as I close the form the ConvertBack method invokes.

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