index [in] The start position of the substring. An empty string will be returned if index is greater than the length of the CTString. If index is negative, a CTException is thrown with the error code set to CTDBRET_INDEXRANGE (4005).
count [in] The maximum number of characters in the substring.
Description
Retrieves a specified substring of the CTString.
Return
SubString returns the CTString object with the substring.