Using the unsafe keyword. : Unsafe : Unsafe C# Examples

    
using  System;

class  MainClass  {
        public  static  unsafe  String  UnsafeCodeExample(String  s)  {
                int  len  =  s.Length;
                char[]  str  =  new  char[len  +  1];
                string  stemp  =  "";
                int  nPos  =  0;

                fixed  (char*  sptr  =  str)  {
                        //  Copy  the  string  in  backward
                        for  (int  i  =  len  -  1;  i  >=  0;  --i)  {
                                sptr[nPos++]  =  s[i];
                                sptr[nPos]  =  (char)0;
                        }

                        //  Now,  copy  it  back
                        for  (int  i  =  0;  i  <  len;  ++i)
                                stemp  +=  sptr[i];
                }
                return  stemp;
        }
        public  static  void  Main()  {
                String  s  =  UnsafeCodeExample("This  is  a  test");
                Console.WriteLine("Reversed:  {0}",  s);
        }
}