Passing array between forms and managing in arrays

Question

I want to transfer an array from Form1 to Form2, then on Form2 add some values to the array. On Form1 button click I put this code:

        int[] arrayOfInt          


        

Answer 1

Don't use arrays if you want a data structure that you need to add items to.

Use a generic collection like List.

In your case, a list of integers would be a List.

IList listOfInt = new List();
listOfInt.Add(19);
listOfInt.Add(12);
Form2 frm2 = new Form2();
frm2.TakeThis(listOfInt);
frm2.Show();

When on Form2, your TakeThis function would look like this:

public voidTakeThis(IList listOfInt)
{
  listOfInt.Add(34);
}

This will also work when passing the list to another form, as List is a reference type whereas arrays are value types. If you don't know what this means, see this article.