String vs StringBuilder in C# #Shorts

Why does building a big string in a loop grind your app to a crawl? It's string immutability — every plus concatenation allocates a brand new string on the heap, turning a simple loop into quadratic-time garbage collection pressure. This Short breaks down how StringBuilder fixes it with a single resizable buffer, plus a simple rule of thumb for when to reach for each one. Zero to Pro is a series of short, focused explainers on the C# and .NET concepts that trip developers up. New one dropping regularly — subscribe to keep leveling up. TIMESTAMPS 00:00 String vs StringBuilder (intro) 00:15 Immutable vs Buffer — the mechanism 00:28 Quadratic vs Linear — the gotcha 00:44 The rule of thumb — string or builder? 00:53 Recap