title: Group by in Datagrid View
body: <p>i have a scenario where i have to group the PinCode by city name like one city can have many pincode.</p>
  
  <p>I have to do this in winform in datagrid. How can i do this so in datagrid i can see the + and - on before city.</p>
  
  <p>I thing it can be done by nested grid. please, help.</p>
  
  <hr>
  
  <h2>     Column A   |   Column B   |   Column C</h2>
  
  <ul>
  <li>Country
  <ul>
  <li>Zip Code  |       10,00     |       15,00</li>
  <li>Zip Code  |       10,00     |       15,00</li>
  </ul></li>
  <li>Country
  <ul>
  <li>Zip Code  |       10,00     |       15,00</li>
  <li>Zip Code  |       10,00     |       15,00</li>
  </ul></li>
  </ul>
  
  <p>Thanks.
  Shivam</p>