how to retrieve datagridview combobox columns selected value

Question

i would like to know what is the selected value of a combobox column in the datagrid view.

for example, i have a combobox called category in my datagrid view. and if the category has values filled up a table in access. and i want to display it in messagebox once its selected/updated.

i am not sure what events should i use .. i tried something like this .. but its not working

 

private void dgv1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)

{

combo = e.Control as ComboBox;

if (combo != null)

{

combo.SelectedIndexChanged -= new EventHandler(combo_SelectedIndexChanged);

combo.SelectedIndexChanged += combo_SelectedIndexChanged;

}

}

private void combo_SelectedIndexChanged(object sender, EventArgs e)

{

string selected = (sender as ComboBox).SelectedItem.ToString();

MessageBox.Show(selected);

}