How to index a last item in an array

//creates an array of strings, split along the slashes
// ie {"c://", "users", "jtilson" etc}
string[] an_array = @"C:\\Users\\jtilson\\Desktop\\Metrics\\Advance Directives_Metrics x3A 134308.xls".Split('\\');
//uses the length of the array minus one as an index, grabbing the last string out of the index
string last_item = an_array[an_array.Length - 1];