for

You can return the number of elements in an array by using the Length property

Debug.WriteLine aiArrayIntegers(10).Length; 

All arrays are zero based

for (int I = myArray.GetLowerBound(0); I <= myArray.GetUpperBound(0); i++) 
{ 
     Debug.WriteLine(aiArrayIntegers(i); 
} 

for (int I = 0; I <= myArray.Length - 1; i++) 
{ 
     Debug.WriteLine(aiArrayIntegers(i); 
}