8 Most common mistakes C# developers make

by PAWEL BEJGER

1. String concatenation instead of StringBuilder

2. LINQ – ‘Where’ with ‘First’ instead of FirstOrDefault

3. Casting by means of ‘(T)’ instead of ‘as (T)’ when possibly not castable

4. Not using mapping for rewriting properties

5. Incorrect exceptions re-throwing

6. Not using ‘using’ for objects disposal

7. Using ‘foreach’ instead of ‘for’ for anything else than collections

8. Retrieving or saving data to DB in more than 1 call

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