What is the difference between Dictionary and Hashtable in C#?

What is the difference between Dictionary and Hashtable in C#?

The main difference is that Dictionary is generic and type-safe, while Hashtable is non-generic and can store any object.

Can you explain why Dictionary is preferred over Hashtable?

Dictionary is preferred because it provides better performance, type safety, and is easier to use with modern C# features.

Are there any scenarios where I should use Hashtable instead?

You might use Hashtable if you're working with legacy code that requires it, but generally, Dictionary is the better choice.

What about thread safety? How do they compare?

Neither is thread-safe by default, but you can use ConcurrentDictionary for thread-safe operations instead.