Display a Tooltip when the user hovers the mouse over a control

AKA mouseover, hovertext.

To display a message over one specific control

            string message = WORKCENTERS_FOR_ROUTESTEP_STRING + lbRouteSteps.SelectedItem.ToString();

            lblSelectedRouteStep.Text = message;

            System.Windows.Forms.ToolTip ToolTip1 = new System.Windows.Forms.ToolTip();

            ToolTip1.SetToolTip(this.lblSelectedRouteStep, message);

For displaying over multiple controls on a form

Instantiate a form-scoped ToolTip object.

        // For display of mouseover text on various controls.

        private ToolTip _tooltip = new System.Windows.Forms.ToolTip();

Add logic to update the hovertext. Set to empty string to hide it.

            string sn = txtSerialNumber.Text;

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            if (_mq.IsSerialNumberValid(sn))

            {

                // Get the part number, and templates, and set all the LEDs.

                pbSerialNumberLED.Image = Properties.Resources.led_green_black_sm;

                _tooltip.SetToolTip(pbSerialNumberLED, “”);

            }

            else

            {

                // Indicate the P/N was not found in MES.

                pbSerialNumberLED.Image = Properties.Resources.led_amber_black_sm;

                _tooltip.SetToolTip(pbSerialNumberLED, NON_MES_SN);

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