c# - Validating binding, depending on which button is clicked -

i searched lot, didn't find right solution.

i have textbox, datagridview, 3 buttons , bindingsource.

when click button 'change' set binding , data loaded datagridview textbox, works:

textbox.databindings.add("text", bindingsource, "name", true, datasourceupdatemode.onpropertychanged); 

when click button 'cancel' binding cleared:

textbox.databindings.clear(); 

but data still transferred datagridview. think it's because of onpropertychanged. when change onvalidation, know saved, when it's validated.

but how can validate or refuse validation? have 2 buttons, , depending on whether 'save' button or 'cancel' button clicked, should transferred datagridview or not.

and event

textbox.validating += textbox_validating; 

i didn't running, because function called before can click button.

how can achieve this?

you can create binding datasourceupdatemode.never , store in form level variable (field). can use writevalue method apply changes (respectively readvalue revert changes).

something this:

form:

binding namebinding; 

change button click:

namebinding = textbox.databindings.add("text", bindingsource, "name", true, datasourceupdatemode.never); 

cancel button click:

namebinding.readvalue(); textbox.databindings.clear(); namebinding = null; 

save button click:

namebinding.writevalue(); textbox.databindings.clear(); namebinding = null;