Zero-based index of the character in the CSimpleStringT object. The iChar parameter must be greater than or equal to 0 and less than the value returned by GetLength. Otherwise, GetAt will generate an exception.
Call this method to return the one character specified by iChar. The overloaded subscript () operator is a convenient alias for GetAt. The null terminator is addressable without generating an exception by using GetAt. However, it is not counted by GetLength, and the value returned is 0.