How to do deep copy in lists

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C#

var contentItem = new List<Dictionary<string, object>>();

                foreach (var dictionary in (List<Dictionary<string, object>>)reciptDictionary["Content"])
                {
                    contentItem.Add(dictionary);
                }

Like this Im creating a new list (contentItem) using existing list(reciptDictionary).
But in here when I change values in contentItem it also change values in reciptDictionary. I dont want that. I want original list to remain same.

Can someone please tell me how to do this. Thanks