title: How to get datagridviewcheckboxcolumn value c#?
body: <p>In my window form application I have a datagridview which has a checkbox column I want to retrieve its value is checked or not I attempted</p>
  
  <pre><code>    if ((bool)dataGridView1[columnindex,rowindex].Value ==true )
  {
     MessageBox.show ("checked");
   }
  </code></pre>
  
  <p>but it doesn't work 
  please answer me</p>