Use fixed to get a pointer to the start of a string

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/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// Use fixed to get a pointer to the start of a string. 
 
using System; 
 
public class FixedString { 
  unsafe public static void Main() { 
    string str = "this is a test"; 
 
    // Point p to start of str. 
    fixed(char* p = str) { 
 
      // Display the contents of str via p. 
      for(int i=0; p[i] != 0; i++) 
        Console.Write(p[i]); 
    } 
 
    Console.WriteLine(); 
     
  } 
}