SelectedText or selectedItem of datagridview

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C#

For getting the SelectedIndexchanged of Datagridview combobox column I am using following code:

private void gvTrail_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
  ComboBox cb = e.Control as ComboBox;
  string select=cb.SelectedText;
  if (cb != null)
  {
    // first remove event handler to keep from attaching multiple:
    cb.SelectedIndexChanged -= new
    EventHandler(cb_SelectedIndexChanged);
    // now attach the event handler
    cb.SelectedIndexChanged += new
    EventHandler(cb_SelectedIndexChanged);
  }
}

void cb_SelectedIndexChanged(object sender, EventArgs e)
{
  MessageBox.Show("Cought...");
}

It is working fine, but the problem I am facing is I am not getting value like SelectedText or selectedItem of datagridview combobox column.
Please help me!