managing objects in callback

Question

I have a program that gets callback from an external program.  It sends back a type object[] that is of variable length.  I want to take the parts of the object[] and put them into native data types (int).  In the callback, I get an object called 'ObjectOfIntegers'.  It has a built in method (from the third party application called 'get'.  'get' returns an object[] that has all the things i ask for.  The third party program's 'get' function obviously is the barrier.  so it looks something like this:

ObjectOfIntegers.get("Integer1,Integer2")

or it could be

ObjectOfIntegers.get("Integer1,String1")

If I know I am getting integers, I want to be able to put them in native data types and then use them (ie put them in myInteger1, myIntegery2, myString1, etc).   so i declare the integers and strings globally and then want their assignment to be done in the callback.  i've tried these two ways:

1)
private int[] intArraySize2 = new int[2];
private int myInteger1, myInteger2;

private void someCallbackFunction(ThirdPartyDataType ObjectOfIntegers)
{
Array.Copy(((Array)ObjectOfIntegers.get_Get("Integer1,Integer2")), intArraySize2, 2);

myInteger1= intArraySize2[0];
myInteger2= intArraySize2[1];
}

2)
private Object[] dataObject = null;
private int myInteger1, myInteger2;

private void someCallbackFunction(ThirdPartyDataType ObjectOfIntegers)
{
dataObject = (Object[])ObjectOfIntegers.get_Get("Integer1,Integer2");

myInteger1= (int)dataObject.GetValue(0);
myInteger2= (int)dataObject.GetValue(1);
}


Does anyone know which would be faster?  Is there a better way to handle this?  Speed is the most important issue to me.  If anyone has any ideas of what to do, how to do it faster, or where to go for more information I would REALLY appreciate it.  Thanks so much.