private void buttonClose_Click(object sender, EventArgs e)
        {
            if (_DB2Access != null)
            {
                try
                {
                    _DB2Access.Close();
                    _DB2Access = null;
                }
                catch
                {
                }
            }

            Close();
        }
        private void buttonConnect_Click(object sender, EventArgs e)
        {
            try
            {
                _DB2Access = new Common.DB2Access();
                //_DB2Access = new Common.DB2AccessODBC();
                _DB2Access.ConnectingString = textBoxConnString.Text;
                _DB2Access.Open();

                FieldsLock(false);
                FieldsImageLock(true);
                FieldsClear(false);

                textBoxImageID.Focus();
            }
            catch (System.Exception ex)
            {
                this.labelMsg.Text = ex.Message;
            }
        }
        private void buttonDisconnect_Click(object sender, EventArgs e)
        {
            if (_DB2Access == null)
            {
                return;
            }

            try
            {
                _DB2Access.Close();
                _DB2Access = null;

                FieldsLock(true);
                FieldsImageLock(true);
                FieldsClear(false);
            }
            catch (System.Exception ex)
            {
                this.labelMsg.Text = ex.Message;
            }
        }