Console.WriteLine("The length of this string is {0}", s.Length);
int index = s.IndexOf("a");
if(index >= 0)
{
Console.WriteLine("The index of first 'a' is {0}", index);
}
else
{
Console.WriteLine("'a' does not found.");
}
s = s.Insert(3, "hello");
Console.WriteLine(s);
s = s.Replace("hello", "me");
Console.WriteLine(s);
foreach(string str in s.Split("m"))
{
Console.WriteLine(str);
}