Why does .NET create new substrings instead of pointing into existing strings?

Question

From a brief look using Reflector, it looks like String.Substring() allocates memory for each substring. Am I correct that this is the case? I thought that woul

Answer 1

Adding to the point that Strings are immutable, you should be that the following snippet will generate multiple String instances in memory.

String s1 = "Hello", s2 = ", ", s3 = "World!";
String res = s1 + s2 + s3;

s1+s2 => new string instance (temp1)

temp1 + s3 => new string instance (temp2)

res is a reference to temp2.