String compare result

Question

string str1 = "COMPUTER";

string str2 = "computer";

string str;

int result;

Console.WriteLine();

Console.WriteLine("str1 = '{0}', str2 = '{1}'", str1, str2);

Console.WriteLine("Ignore case:");

result = string.Compare(str1, 2, str2, 2, 2, true);

str = ((result < 0) ? "less than" : ((result > 0) ? "greater than" : "equal to"));

Console.Write("Substring '{0}' in '{1}' is ", str1.Substring(2, 2), str1);

Console.Write("{0} ", str);

Console.WriteLine("substring '{0}' in '{1}'.", str2.Substring(2, 2), str2);

 

in above example, in this line result = string.Compare(str1, 2, str2, 2, 2, true);

why "true" is there? Also when i complie i am getting result as 0, result=0; 

pls let me know.