TextBox.GetSpellingErrorLength Method (Int32)
Returns the length of any spelling error that includes the specified character.
Assembly: PresentationFramework (in PresentationFramework.dll)
The zero-based character index of a position in content to examine for a spelling error.
Return ValueType: System.Int32
The length of any spelling error that includes the character specified by charIndex, or 0 if the specified character is not part of a spelling error.
Available since 3.0