title: Error: "DataGridViewComboBoxCell value is not valid." DataSource is list of basic type
body: <p>I couldn't find a question on SO that <em>exactly</em> matched my problem.</p>
  
  <p>Similar to <a href="https://stackoverflow.com/q/654829/99640">this question</a> and <a href="https://stackoverflow.com/q/2753687/99640">this question</a>, I'm setting the <code>DataSource</code> on a <code>DataGridViewComboBoxColumn</code> to a list of things. In my case the things are simple types like doubles and ints, so the answers talking about ValueMembers and DisplayMembers don't do me a lot of good. When the user selects a value I get the dreaded "DataGridViewComboBoxCell value is not valid" error.</p>
  
  <p>I could swallow the error with an empty dataGridView_DataError handler, but that is obviously a bad way to go.</p>