title: How to clear a data grid view
body: <p>I am trying to populate a DataGridView based on the selected item in a ComboBox, I have this part working.</p>
  
  <p>However, I need to be able to clear the grid before adding the new data from a new item rather than it just adding on to the end. </p>
  
  <p><strong>How do I clear a DataGridView before adding items to it?</strong></p>