How Can I Concatenate Two Lists While Removing Duplicates and Preserving Order?

Concatenating Lists with Distinct Elements

Suppose you have two lists of the same type and desire to merge them while maintaining the original order and eliminating duplicates. Here's a swift solution:

Utilizing the AddRange method provides a simple way to concatenate two lists. By adding b to a, you effectively merge them. However, this method does not remove duplicates.

For duplicate removal, consider the Concat method instead:

var newList = a.Concat(b);

Concat returns an IEnumerable, which ensures that a remains unmodified. This approach preserves the order of the elements and maintains uniqueness.

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