The change events in ComboBox

ComboBox contains three items: 1, 2, and 3.

1 is selected for 1st times, and all four events are triggered. When I select 1 again, 4 does not appear, and 3, 2, and 1 both appear.

Private void combobox#selectedindexchanged (Object sender, eventargs E)

{

MessageBox. Show ("1 ");

}

 

Private void combobox#selectedvaluechanged (Object sender, eventargs E)

{

MessageBox. Show ("2 ");

}

 

Private void combobox#selectionchangecommitted (Object sender, eventargs E)

{

MessageBox. Show ("3 ");

}

 

Private void combobox1_textchanged (Object sender, eventargs E)

{

MessageBox. Show ("4 ");

}