//addSalesAvailabilityForEditItem
private void editItem(int frameItemIDEdit, int itemQuantityEdit, int rowIndex)
{
addSalesAvailability AvailabilityForm = new addSalesAvailability(this, frameItemIDEdit, itemQuantityEdit, rowIndex);
AvailabilityForm.ShowDialog();
}
//addSalesAvailabilityForNewItem
private void newItem()
{
addSalesAvailability AvailabilityForm = new addSalesAvailability(this);
AvailabilityForm.ShowDialog();
}