I have CheckBox in my datagridview1 and I am trying to get CheckBox is check or not.

for(int i; i< datagridview1.rows.count; i++)
{
bool IsChecked = ((CheckBox)datagridview1.rows[i].Cell["ID"].Value).Checked;
}

Above code is not working,please let me know where I am wrong.
I am using C#, VisualStudio2008.

Thanks