How to get Value from One textbox to another instantly on a single form c# -

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i have 4 textboxes on form in windows form. named: id, session, class, section. need generate id in id_txtbox instantly session, class , sections inserted , save db. id contain (session+class+section).

problem how can data on single form these 3 txtboxes (session, class, section) , special id without clicking button ?

use textbox.textchanged event , validate if input matches requirements. if so, save database. it's possible attach textboxes same event way.

i'm assuming need generate id yourself, if can use guid class this.


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