Please help me in displaying parent and child rows in a single datagrid view?

Question

Hi...
 
Can u please help me in displaying parent and child rows in a single datagrid view in windows applications.
My requirement is a + sign should be there in the datagridview. on clicking that + sign child rows should get displayed for that parent row. How can i achieve that in windows forms. Please help me in this regard.
Expecting a earlier response as the requirement is urgent.
 
My another email address is [email protected]
 
Regards
Shwetha