In this article we will revel the use of one of the advanced control of Xaml file is Rich Edit Box, Rich Edit Box come with lot of knew feature which make user more comfortable to write the text in Text Box. Here we will enable two feature of Rich Text Box one is Spelling check and second one is text prediction that will work on run time when user write some text. The system check the spelling at run time and give the suggestion for right spelling if it would find wrong. And second option predict the word from their dictionary and correct it automatically.