Here's the sample,i want to populate a checkbox value according to Gridview's selected row's 9th cell value so i did this ===>
string valuechk = dataGridView1.CurrentRow.Cells[9].Value.ToString ();
bool chkvalue = Convert.ToBoolean(valuechk);
if(chkvalue ==false)
assignchk.Checked = false;
else
assignchk.Checked = true;
Now make your code as per your requirementHeres