What are some common mistakes with collection types in C#?

What are some common mistakes with collection types in C#?

Some common mistakes include using the wrong collection type, not initializing collections, and misunderstanding reference types.

Can you explain why using the wrong collection type is a mistake?

Using the wrong collection type can lead to performance issues and increased complexity. For example, using a List when a HashSet is more appropriate can slow down lookups.

What about not initializing collections?

Not initializing collections can lead to NullReferenceExceptions. Always ensure your collections are instantiated before use.

Are there any specific examples of collection types I should avoid?

Avoid using ArrayList in favor of generic collections like List<T>, as ArrayList is not type-safe and can lead to runtime errors.