Using unsafe with strings C# with Example

// The string referenced by variable 's' is normally immutable, but 
var s = "Hello"; 
// since it is memory, we could change it if we can access it in an 
// unsafe way. 
unsafe // allows writing to memory; methods on System.String don't allow this 
{ 
fixed (char* c = s) // get pointer to string originally stored in read only memory 
for (int i = 0; i < s.Length; i++) 
c[i] = 'a'; //  change  data  in  memory  allocated  for  original  string  "Hello" 
 

} 
Console.WriteLine(s); // The variable 's' still refers to the same System.String 
// value in memory, but the contents at that location were 
// changed by the unsafe write above. 
// Displays: "aaaaa"