ReplaceItem() public method

Replace all occurences of "Search string" by "Replace String" in current selected item.
public ReplaceItem ( ) : int
return int
        private void btnReplace_Click(object sender, EventArgs e)
        {
            if (_fr == null || _fr.l_items.Count == 0)
            {
                MessageBox.Show("Start search with 'Find'");
                return;
            }
            if (_fr.l_items[_fr.Index].isUpdated)
            {
                MessageBox.Show("Changes already done!");
                return;
            }

            // update replace string
            _fr.replaceString = txtReplaceString.Text;
            if (txtReplaceString.Text.Trim() == "")
            {
                DialogResult result = MessageBox.Show("", "Replace with string empty?", MessageBoxButtons.YesNo);
                if (result == DialogResult.No)
                {
                    return;
                }
            }
            _fr.ReplaceItem();
            _fr.FindNext();
            _fr.LocateCurrentElement();
            txtStatus.Text = _fr.ItemShortDescription();
        }