C#

// Not-tested code! 
public class MyDef : IClonable {
    ...
    // I always have a constructor like this:
    protected MyDef(MyDef original){
        // Copy all private fields from original
    }
    // Usually i implement IClonable:
    public object Clone {
        return new MyDef(this)
    }
    // You can also use your Copy approach
    public static MyDef Copy(MyDef original){
        return new MyDef(original)
    }
    ...
}

// Make class implement IClonable
public class MyDef : ICloneable
{
 private int someInt;
 private string someString;

 // Default constructor
 public MyDef()
 {
 }

 // Protected constructor, for cloning/copying
 protected MyDef(MyDef original)
 {
   // Copy all the fields from original
   this.someInt = original.someInt;
   this.someString = original.someString;
 }

 // IClonable implementation
 // Advantage: you've implemented IClonable, thats ususally a good thing if you want your class to be copyable
 // Disadvantage: You have to manually cast the returned object to a MyDef
 public object Clone()
 {
   return new MyDef(this);
 }

 // If you want, you can do this (like your copy(obj1, obj2) idea)
 // Advantage: -It's static, so you can just do MyDef.Copy(...)
 //            -The returned value is already of type MyDef, no need to typecast  
 // Disadvantage: It's not the way it's 'supposed' to go
 public static MyDef Copy(MyDef original)
 {
   return new MyDef(original);
 }
}

public override bool Equals(object obj){
 // Check if all fields are equal
 // If so, return true, if not equal return false
}
// I never operator overloaded anything, so i hope this makes sense...
public operator ==(object obj){
 return this.Equals(obj)
}

<br />
        public Card(Card c)<br />
        {<br />
            m_Rank = c.GetRank();<br />
            m_Suit = c.GetSuit();<br />
        }<br />
<br />
        public object Clone()<br />
        {<br />
            return new Card(this);<br />
        }<br />

<br />
        public void Shuffle()<br />
        {<br />
            Random rand = new Random();<br />
<br />
            for (int i = 0; i < 52; i++)<br />
            {<br />
                int first = rand.Next(52);<br />
                int second = rand.Next(52);<br />
<br />
                // Copy data from random card 1 to tempcard<br />
                // Copy data from random card 2 to card 1<br />
                // Copy data from tempcard to card 2<br />
                Card tempCard = m_Deck[first].Clone();<br />
                m_Deck[first] = m_Deck[second].Clone();<br />
                m_Deck[second] = tempCard.Clone();<br />
            }<br />
<br />
        }<br />

Rank r = (Rank)i;

DialogResult dr = MessageBox.Show("Your data has errors, Continue?","Error!",MessageBoxButtons.YesNo);
if(dr == DialogResult.Yes)
{
   // set errorFound property = true
   // save data
}