c# - Windows Form tabpage event -

i have windows form application , in created 2 tab pages. in 1 of tab page have button send email notification. in tabpage leave event have code perform other actions. when click on button send email. first fires tabpage leave event , ithe button contains button1.enabled=false; in first line below,

 private void btntestemail_click(object sender, eventargs e)         {             btntestemail.enabled = false;             bool sent = support.sendemail("test email", "this test email, please ignore.", null); -- } 

but when remove btntestemail.enabled = false; code not firing tabpage leave event. reason fires leave event of tab page. vbery strange behaviour. dont want fire event of tab page .

regards

changing btntestemail.enabled false change activecontrol, fires leave event.

according msdn:

when change focus using keyboard (tab, shift+tab, , on), calling select or selectnextcontrol methods, or setting containercontrol.activecontrol property current form, focus events occur in following order:

1. enter

2. gotfocus

3. leave

4. validating

5. validated

6. lostfocus

what can do:

what eliminate behavior unsubscribing leave event , re-subscribing after setting enabled property false.

like this:

this.tabpage1.leave -= new system.eventhandler(this.tabpage1_leave);  btntestemail.enabled = false;  this.tabpage1.leave += new system.eventhandler(this.tabpage1_leave);