Check out example codes for "Lists - Learn C#". It will help you in understanding the concepts better.

Code Example 1

List<string> food = new List<string>();
food.Add("apple");
food.Add("banana");

List<string> vegetables = new List<string>();
vegetables.Add("tomato");
vegetables.Add("carrot");

food.AddRange(vegetables);
Console.WriteLine(food.Count);

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