Why writing items to console writes only namespace and class name instead of data? [duplicate]

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You are passing object to the Console.WriteLine(item) instead of passing the string. Console.WriteLine invokes ToString() method of that object that by default returns namespace+class name. You can override this behavior like next:

    public class City //class
    {
        public string CityName { get; set; }
        public int Temperature { get; set; }

        public City(string name, int temp)//konstruktor 
        {
            this.CityName = name;
            this.Temperature = temp;
        }

        public override string ToString()
        {
            return string.Format("{0} {1}", CityName, Temperature);
        }

    }

Or you can use another overload of WriteLine method:

Console.WriteLine("{0} {1}", item.CityName, item.Temperature);

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