Requirement is to handle DuplicateChildNodeNameException. In case of this scenario, we need to give an option to the user whether s/he wants to Override the existing document or want to specify a new name. A pop up should display with errormessage as "Node with same name already exist. Select Yes if you want to override the existing node OR selet No for specifying a new name". In case user selects Yes, the existing node should get replaced with new node and in case of No, we should give the popup to user to specify a new name.