C # CompareTo Comparison of strings that makes me wonder where

The Copareto method is used when learning to choose the sorting algorithm. Because of the comparison of the number, it is at random input.

When I enter the string "8", it is compared to the string "16".

            String str1 = "8";            String str2 = "+";            String str3 = "n";            Console.WriteLine (Str1.compareto (STR2));//Results show 1            Console.WriteLine (Str3.compareto (STR2));//Results show-1

Obviously, I originally thought that "8" and "16" compare, the result is-1. It's not true.

As for, why the string "8" compares to the string "16" returns 1. For this reason, to be sure.

Todo

C # CompareTo Comparison of strings that makes me wonder where