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Код

using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;
using System;

namespace EditObjectCopyTest {
    public partial class TestForm : Form {
        Foo foo;
        public TestForm() {
            InitializeComponent();
            foo = new Foo();
            foo.ID = 12345; // init source object
        }
        private void OnEditButtonClick(object sender, EventArgs e) {
            using (FooEditForm editForm = new FooEditForm(foo)) {
                if (editForm.ShowDialog() == DialogResult.OK) {
                    Foo newValue = (Foo)editForm.EditValue;
                    //.. do something with new value
                }
            }
        }
    }
    //
    [Serializable]
    public class Foo {
        int objID;
        public int ID {
            get { return objID; }
            set { objID = value; }
        }
    }
    public class FooEditForm : BaseEditForm {
        public FooEditForm(Foo foo) : base(foo) { }
        protected override void OnLoad(EventArgs e) {
            base.OnLoad(e);
            ((Foo)EditValue).ID = 54321; //Edit object copy
        }
    }
    public abstract class BaseEditForm : Form {
        object editValueCore;
        protected BaseEditForm(object value) {
            this.editValueCore = MakeEditableCopy(value);
        }
        public object EditValue {
            get { return editValueCore; }
        }
        protected object MakeEditableCopy(object value) {
            object copy=null;
            BinaryFormatter formatter = new BinaryFormatter();
            using(MemoryStream ms = new MemoryStream()){
                formatter.Serialize(ms,value);
                ms.Seek(0, SeekOrigin.Begin);
                copy = formatter.Deserialize(ms);
                ms.Close();
            }
            return copy;
        }
    }
}