c# - How should I remove objects from a list when a cancel dialog result is returned? -

i writing c# forms application have many list<t> lists. have many forms can add , remove objects these lists. if users presses cancel button, , dialog result returned cancel, how best way remove data added lists form?

should take 'snapshot' of lists beforehand, , restore lists, or there better approach?

all lists inherit icustomobject interface, , these lists stored in 1 place. not specific each form, each form can add , edit items in lists.

thanks.

i'd create backup of lists , revert changes if user press cancel.

var list1 = new list<int>() { 1, 2, 3}; var list2 = new list<string>() { "abc", "def", "ghi"};  object[] tempdata = new[] { list1.tolist(), list2.tolist() };  //... user changes in list1, list2 ... list1.add(12); list1.remove(3); list2.remove("def");  if(cancel) {    list1 = tempdata[0] list<int>;    list2 = tempdata[1] list<string>;  }