You can use the AutoCorrect property to automatically correct spelling errors as you type. Therefore, it requires the SpellAsYouType flag turned on.

It will auto correct a misspelled word if there is only one suggestion for that spelling error. Otherwise it will leave the word as underline to be fixed by the user. This is how it works in Microsoft Word.

In this text, "cleanlyness" has only one suggestion. If you edit this text to go to the end of "cleanlyness" (right before comma) and press space it will automatically correct that word. You can experiement with your own text as well.

You can also set the CapitalizeFirstLetterOfSentences property to true in order to capitalize the first letter of a sentence automatically.

You can customize your list of auto corrections in a text file such as en-US.auto under the same dictionary folder to specify one suggestion per each misspelled word. If there is a match with the misspelled word in this file, only the corresponding suggestion will be returned without doing any further spell checking.