A RichTextBox is mainly used if you want more control over the styling of text, type, font, alignment, etc. So, all that you can do in Microsoft Word, you can do with RichTextBox. It can be used to save or display .rtf files with ease.
A The text box is mainly used to display or enter one string input. You may have a multi-line TextBox, which is mainly used to display or retrieve multiple single-line images and prevents you from managing multiple text blocks. In addition, your user interface is a bit neat.
Thus, the main difference is stylization. If you just want something simple and simple, use a TextBox. If you want something fantastic, for example, styles, colors use RichTextBox.
Look at this:
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