C# replace string in string

Question

Is it possible to replace a substring in a string without assigning a return value?

I have a string:

string test = "Hello [REPLACE] world";
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Answer 1

Strings in .NET are immutable. They cannot be edited in-line.

The closest you can get to in-line editing is to create a StringBuilder from a string. In-line fiddles with its contents and then get it to spit a string back out again.

But this will still produce a new string rather than altering the original. It is a useful technique, though, to avoid generating lots of intermediary strings when doing lots of string fiddling, e.g. in a loop.