tx.cs

TXTextControl.Proofing.TXSpell spell = new TXTextControl.Proofing.TXSpell();
spell.Create();

using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl())
{
    tx.Create();
    tx.SpellChecker = spell;
    tx.IsHyphenationEnabled = true;

    // your code here
}