title: at a time only one check box should be selected in a particular row
body: <p>I have a datagridview. It has 2 columns which are of type boolean. Now what I want to do is, when I click on one checkbox the other check box in the same row should be unchecked. that is, at a time only one check box should be selected in a particular row. The user should not be able to select the 2 check boxes together.</p>
  
  <p>How can I achieve this ? I tried using cellcontentclick and cellcontentChanged events. nothing works.</p>
  
  <p>any inputs ??</p>