foreach (ListViewItem ListItem in listView_Replacement.Items)
                {
                    // finding the string in the current item rows
                    string m_findText = listView_Replacement.Items[0].Text;
                    string m_replaceText = listView_Replacement.Items[0].SubItems[1].Text;

                    string m_Messagetext = txtMessage.Text;

                    string m_MessageTextNew = txtMessage.Text.Replace("" + m_findText + "", "" + m_replaceText + "");

                    txtMessage.Text = m_MessageTextNew;

                    txtMessage.Refresh();
                }