controls in runtime
i have a textbox array using that i create 20 text boxes in runtime, i need to get the focus if a particular text box(if i press downarrow in keyboard how to get the key down of a particular text box it can be 3rd text box).
You can add an Event-Handler to your KeyDown-Event:
yourTextboxArray[x].KeyDown += new KeyDownEventHandler(yourMethodHere);
The event has two parameters, sender (Object) and e (KeyDownEventArgs). You can use the sender to determine what Textbox has send the KeyDown.
Textbox txb_sender = sender as Textbox; if(txb_sender != null) // do something here with it