How can I copy an instance of a class in C#

An easy way to clone an object is writing it into a stream and read it again:

public object Clone()
{
    object clonedObject = null;
    BinaryFormatter formatter = new BinaryFormatter();
    using (Stream stream = new MemoryStream())
    {
        formatter.Serialize(stream, this);
        stream.Seek(0, SeekOrigin.Begin);
        clonedObject = formatter.Deserialize(stream);
    }

    return clonedObject;
}

But be aware of, that this can cause problems with so called aggregate object.