/// <summary>
/// Delete data
/// </summary>
/// <param name="list">data list</param>
/// <param name="po">printer object</param>
/// <returns>if at least one item removed</returns>
public static bool DeleteData(ListBox list, PrinterObject po)
{
bool atLeastOne = false;
for (int index = list.SelectedIndices.Count - 1; index >= 0; --index)
{
int pos = list.SelectedIndices[index];
po.DeleteData(pos);
list.Items.RemoveAt(pos);
hasModified = true;
atLeastOne = true;
}
list.Refresh();
return(atLeastOne);
}