why is string value not changed?

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• 

  Rajeev Kumar3y agoPosted Mar 14, 2023, 10:22 AM

  Accepted answer

  String value can not be changed Because it is Refrence Type and a string is immutable each and every time it store a new addres for  memory Location.
• 

  Satya Karki5y agoPosted Jun 22, 2021, 5:23 PM

  Hi,

   

  The output is correct as you are not changing the value.

   

   

   

  This is because of  Immutability of String Objects

  Example: 

   

  1. string s1 = "abc";  
  2. string s2 = s1;  
  3. s1 = "def";  
  4. Console.WriteLine(s2);  
  5. // Output: abc  

   

   Check this

   https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/strings/#immutability-of-string-objects

   

   

   

   
• VM

  Valerie Meunier5y agoPosted Jun 22, 2021, 12:57 PM

  Thanks
• 

  Sachin Singh5y agoPosted Jun 22, 2021, 11:22 AM

  Yes, this is the most famous interview question as well.

  The answer is c# strings are immutable, each time a new value is assigned to the string a new memory location is created.

  means if you will do 

  1. for(int i=0; i<1000;i++)  
  2. {  
  3.  str= str+i;  
  4.   
  5. }  

  then it means 1000 new memory locations will be created, to avoid this we use StringBuilder and append the value instead of simply concatenating.

   If the value is not changed then no new memory location will be created.

  1. for(int i=0; i<1000;i++)    
  2. {    
  3.  str= str;    
  4.     
  5. }    

  so, above there will be one memory location, this is called interning. 

  so, yes string are reference type but behave as value types.