I'm making a C# WPF application and currently have a DataGrid that contains various elements including a RichTextBox so that users can edit the text. However I would like to also give the option of making specific parts of the Text contained in the RichTextBox bold. This should be done by selecting part of the Text in a TextBox and pressing a button, that would make the selected text bold.

Hopefully this helps and addresses your concern, if any issues please let me know.