True if the text location is a valid location

The location of the item referred to. If this is an IText the TextOffset property determines the location inside that text. The root of the location should be a IParagraph container.

When the Location property refers to an IText item, this property indicates the 0-based character index inside the text that the text position refers to. This property should be a valid 0-based index into the text. It should be less than or equal to the number of characters in the text.