string.Remove(0, 2)

    class Program
    {
        static void Main(string[] args)
        {
            string test = "abcdefg";
            
            Console.WriteLine(test.Remove(0, 2));
            Console.WriteLine(test.Remove(5));
            Console.WriteLine(test);
/*
cdefg
abcde
abcdefg
请按任意键继续. . .
*/
        }
    }