Most efficient way to concatenate strings?

Question

What\'s the most efficient way to concatenate strings?

Answer 1

The most efficient is to use StringBuilder, like so:

StringBuilder sb = new StringBuilder();
sb.Append("string1");
sb.Append("string2");
...etc...
String strResult = sb.ToString();

@jonezy: String.Concat is fine if you have a couple of small things. But if you're concatenating megabytes of data, your program will likely tank.