Csharp Generic List Problem

Hi dear Guru's. First of all sry about my english.
My problem is , i got a 2 generic lists

public class List1
    {
        public string Tag { get; set; }
        public byte[] Resim1 { get; set; }
        public byte[] Resim2 { get; set; }

    }

    public class List2
    {
        public string Tag { get; set; }
        public byte[] Resim { get; set; }
    }

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I need to copy List1 items to List2...How i can do it ? ty for ur interest