C#

<br />
string[] toto = new string[3];<br />
// ...<br />
// ... Muck with the array's values<br />
// ...<br />
<br />
string[] newToto = new string[4];<br />
Array.Copy(toto, 0, newToto, 0, toto.Length); // Here's the "preserve" part<br />
toto = newToto;<br />
newToto = null; // Not always necessary<br />

public class FirstForm : Form
{
  // ...
  private void btnSecondForm_Click(object sender, EventArgs e)
  {
    // For example, pass a referenec to "this" form into the constructor for
    // the second form.
    using (SecondForm form = new SecondForm(this))
    {
      form.ShowDialog(this);
    }
  }
  // Gets the ListView declared and initialized in this class.
  internal ListView TheListView
  {
    get { return theListView; }
  }
}
internal class SecondForm : Form
{
  // ...
  private FirstForm parent;
  public SecondForm(FirstForm parent)
  {
    this.parent = parent;
  }
  private void btnOK_Click(object sender, EventArgs e)
  {
    ListView view = parent.TheListView;
    if (view != null)
    {
      // Fill "view" with data.
      this.DialogResult = DialogResult.OK; // Closes form, too.
    }
  }
}