KB: How can I programmatically ignore certain regions in the text with RapidSpellDialog? (C#)

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How can I programmatically ignore certain regions in the text with RapidSpellDialog? (C#)
https://keyoti.com/kb/Default.aspx?ToDo=view&questId=151&catId=62

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[For a how-to with RapidSpellAsYouType, using it's IsInIgnorePos method, please see http://keyoti.com/kb/Default.aspx?ToDo=view&questId=114&catId=44]

1. add the following class

class CustomRapidSpellChecker : Keyoti.RapidSpell.RapidSpellChecker
{  	public int CheckRegionStart, CheckRegionEnd;
	public override Keyoti.RapidSpell.BadWord NextBadWord()
	{
		Keyoti.RapidSpell.BadWord bw = base.NextBadWord();
		if (bw == null) return null;
		else
		{			if (wordStart >= CheckRegionStart && wordEnd <= CheckRegionEnd)
				return bw;
			else
				return NextBadWord();
		}
	}
}

2. Then use this class before starting the dialog checker,

CustomRapidSpellChecker checker = new CustomRapidSpellChecker();

rapidSpellDialog1.CheckerEngine = checker;

checker.CheckRegionStart = 5;

checker.CheckRegionEnd = 10;

theTextBox.SelectionStart = 0;

rapidSpellDialog1.Check();

In this example we only check text from char positions 5 to 10. It is of course possible to have multiple regions to ignore, this can be done by modifying the NextBadWord override.

Setting the selection start to 0 is important since wordStart and wordEnd are relative to the cursor position when the checker is started.