How to understand the program is running on a Stationary Computer or on a laptop?

Можно сделать проверку через состояние батареи ноутбука:

switch (SystemInformation.PowerStatus.BatteryChargeStatus)
{
case System.Windows.Forms.BatteryChargeStatus.Low:
MessageBox.Show("Battery is running low.", "Low Battery", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
break;
case System.Windows.Forms.BatteryChargeStatus.Critical:
MessageBox.Show("Battery is critcally low.", "Critical Battery", MessageBoxButtons.OK, MessageBoxIcon.Stop);
break;
default:
// Battery is okay.
break;
}

Code

switch (SystemInformation.PowerStatus.BatteryChargeStatus)

    {

        case System.Windows.Forms.BatteryChargeStatus.Low:

            MessageBox.Show("Battery is running low.", "Low Battery", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

            break;

        case System.Windows.Forms.BatteryChargeStatus.Critical:

            MessageBox.Show("Battery is critcally low.", "Critical Battery", MessageBoxButtons.OK, MessageBoxIcon.Stop);

            break;              

        default:

            // Battery is okay.

            break;

    }

Соответственно всё это занести в try и если батареи не будет - стационарный пк.