No Heap All Stack

When you're comparing strings and you think == will do the job because both strings are "obviously the same," only to discover that string interning and reference equality have other plans. The top panel shows the naive approach using ToLower() on both sides with reference equality—spoiler alert: it creates new string objects on the heap, so they're different references even if the content matches.

The bottom panel is the enlightened developer who discovered string.Equals() with StringComparison.OrdinalIgnoreCase—the proper way to do case-insensitive string comparison without allocating unnecessary objects. No heap allocations for temporary lowercase strings, just pure stack-based comparison logic. Your garbage collector will thank you, and your code reviews will be 10% less painful.