how to get the value of a key by using key in c# code example

Example 1: c# dictionary get value by key

Dictionary<string, string> dict = new Dictionary<string, string>();
 dict.Add("UserID", "test");
 string userIDFromDictionaryByKey = dict["UserID"];

Example 2: dictionary c# get key by value

var myKey = types.FirstOrDefault(x => x.Value == "one").Key;