DataGridViewComboBoxCell selected index

[johntheface]

I have a datagridview that the user can add and delete rows from. one of the columns is a DataGridViewComboBoxColumn. i want to be able to loop through each row in the grid and get the selected index of the combo box for that row. i've tried everything i can think off but can't get it to work. could anyone help me?

something like this:

for (int i = 0; i < DataGridView.Rows.Count; i++)
{
    MessageBox.Show(DataGridView.Rows[i].Cells["ComboBoxColumn"].SelectedIndex.ToString();
}

but obviously this doesn't work because it returns the value of the cell rather than the actual combo box