AllowMixedCase プロパティ

using System.Windows.Forms;
using Infragistics.Win.UltraWinSpellChecker;

private void Form1_Load( object sender, EventArgs e )
{
	//Ignore words with all capital letters
	this.spellChecker.SpellOptions.AllowCapitalizedWords = true;

	//Do not convert misspelled words to all lowercase before looking for suggestions.
	//This could cause "hEelo" and "heElo" to have different suggestions.
	this.spellChecker.SpellOptions.AllowCaseInsensitiveSuggestions = false;

	//Allow words with mixed case ("tHe" will not be a spelling mistake).
	this.spellChecker.SpellOptions.AllowMixedCase = true;

	//Any words with digits in them will be ignored
	//("th4e" will not be a spelling mistake).
	this.spellChecker.SpellOptions.AllowWordsWithDigits = true;

	//Words between '<' and '>' will be spell checked.
	this.spellChecker.SpellOptions.AllowXml = false;

	//Allow compound words ("helloworld" is not a spelling mistake).
	this.spellChecker.SpellOptions.CheckCompoundWords = true;

	//Search for entire hyphenated words in the dictionary, not the separate parts.
	//This causes "hello-world" to be a spelling error.
	//* - To see the effect of this, SeparateHyphenWords below must be set to False
	this.spellChecker.SpellOptions.CheckHyphenatedText = false;

	//Decrease the consideration range for suggestions.  This will
	//increase performance, but less suggestions will be found for errors.
	this.spellChecker.SpellOptions.ConsiderationRange = 5;

	//Don't include words from the user dictionary in te list of suggestions
	this.spellChecker.SpellOptions.IncludeUserDictionaryInSuggestions = false;

	//Use french grammar rules to aid the spell checker in reading the text
	this.spellChecker.SpellOptions.LanguageParser = LanguageType.French;

	//When a hyphated word is mispelled, only underline the part of the hyphenated 
	//word that is incorrect ("heelo-world" will only have "heelo" underlined).
	this.spellChecker.SpellOptions.SeparateHyphenWords = true;

	//When an error is detected to be two combined words, the minimum length 
	//of the suggested split words is four.  "myhouse" would not have "my house" as a suggestion.
	//* - SuggestSplitWords must be True and CheckCompoundWords must be False for this property to take effect
	this.spellChecker.SpellOptions.SplitWordThreshold = 4;

	//Use phonetic suggestions for errors
	this.spellChecker.SpellOptions.SuggestionMethod = SuggestionsMethod.PHONETIC_SUGGESTIONS;

	//Don't suggest split words when an error is determined to be a 
	//compound of two correctly spelled word.
	this.spellChecker.SpellOptions.SuggestSplitWords = false;
}