Contains the zero-based index of the item before the first item to be searched. When the search reaches the bottom of the list box, it continues from the top of the list box back to the item specified by nStartAfter. If nStartAfter is –1, the entire list box is searched from the beginning.
Points to the null-terminated string that contains the prefix to search for. The search is case independent, so this string may contain any combination of uppercase and lowercase letters.