Remove special characters from string?

Short answer: string result = sb.ToString(); Final Notes These questions frequently appear in L1/L2 interviews They test logic clarity, memory, and problem-solving Ideal for LinkedIn posts, reels, ebooks, and interviews

Example code

string input = "Dot@Net#2024!";
StringBuilder sb = new StringBuilder();
foreach (char c in input)
{
if (char.IsLetterOrDigit(c)) sb.Append(c); }

Real-world example (ShopNest)

In coding rounds, state complexity aloud, write a clear ShopNest-flavored example (orders, carts), then handle edge cases (empty list, null, overflow).

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.