If I have 4 different CheckBoxes and when the user selects one of them I want the other 3 to become disabled so you can't click on a checkbox while another one is already checked how would I go about doing this? I have this, but it doesnt work right now and I thought it would: If NoDelayCheckMarkBox.Checked = True Then timeBetweenIterationDelay = 0 SecondDelayCheckMarkBox.Enabled = False HalfSecondDelayCheckMarkBox.Enabled = False FiftyMSDelayCheckMarkBox.Enabled = False I can still click as many check boxes as I want too. Thank you for any help.