private void btnOk_Click(object sender, EventArgs e)
 {
     if (m_oldCobIdx != -1)
     {
         m_csss[cobConnectionString.Items[m_oldCobIdx].ToString()].ConnectionString = txtConnectionString.Text;
         m_csss[cobConnectionString.Items[m_oldCobIdx].ToString()].ProviderName     = txtProviderName.Text;
     }
     foreach (KeyValuePair <string, ConnectionStringSettings> kvp in m_csss)
     {
         SecurityHelper.ChangeConnectionString(kvp.Key, kvp.Value.ConnectionString, kvp.Value.ProviderName);
     }
 }