This method copies all the elements of the current array instance to the array destination array, starting at index index. The array destination array must already have been dimensioned and must have a sufficient number of elements to accommodate the copied elements. Otherwise, the method throws an exception.

This method supports the ICollection interface. If implementing ICollection is not explicitly required, use Array.Copy(Array, Array, int) to avoid an extra indirection.

If this method throws an exception while copying, the state of array is undefined.

This method is an O(n) operation, where n is Array.Length. It performs a shallow copy only.

The following example shows how to copy the elements of one Array into another.

using System;

public class ArrayCopyToExample
{
   public static void Main()
   {
      Array aryOne = Array.CreateInstance(typeof(Object), 3);
      aryOne.SetValue("one", 0);
      aryOne.SetValue("two", 1);
      aryOne.SetValue("three", 2);

      Array aryTwo = Array.CreateInstance(typeof(Object), 5);
      for (int i=0; i < aryTwo.Length; i++)
         aryTwo.SetValue(i, i);

      Console.WriteLine("The contents of the first array are:");
      foreach (object o in aryOne)
         Console.Write("{0} ", o);
      Console.WriteLine();
      Console.WriteLine("The original contents of the second array are:");
      foreach (object o in aryTwo)
         Console.Write("{0} ", o);
      Console.WriteLine();
      
      aryOne.CopyTo(aryTwo, 1);

      Console.WriteLine("The new contents of the second array are:");
      foreach( object o in aryTwo)
         Console.Write("{0} ", o);
   }
}

The output is

The contents of the first array are:

one two three

The original contents of the second array are:

0 1 2 3 4

The new contents of the second array are:

0 one two three 4