How should I concatenate strings?

Question

Are there differences between these examples? Which should I use in which case?

var str1 = \"abc\" + dynamicString + dynamicString2;

var str2 = String.Form         


        

Answer 1

As long as you are not deailing with very many (100+) strings or with very large (Length > 10000) strings, the only criterion is readability.

For problems of this size, use the +. That + overload was added to the string class for readability.

Use string.Format() for more complicated compositions and when substitutions or formatting are required.

Use a StringBuilder when combining many pieces (hundreds or more) or very large pieces (length >> 1000). StringBuilder has no readability features, it's just there for performance.