RadRichTextBox provides several export formats out of the box - XAML, DOCX, HTML, RTF, PDF and Plain text. The functionality utilizes by the respective for each format format provider. In order to export to a custom format you would need to create a custom format provider as well. For this purpose you'd have to implement the IDocumentFormatProvider interface. Please note that creating a custom format provider is not a trivial task.
I hope this helps!
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But I get confused while implementing this, I want When your press Ctrl+S from his keyboard or select save option from ribbon bar on that event I want to execute my code, so how to write this in XAML or how to write my custome SaveCommand in Ribbon bar
help me to implement this or if you have any reference kink for implemented code then give it to me.