生成CSV FIle foreach项并将其列在此列表视图中

I'm workin on a wpf c# solution and I want to write a CSV File for each item in my listview using LinqToCsv, the CSV will be populated by the fields from database. i didn't find a solution for this, now my code generate one csv file including all data and not data for each item. here is my code and a screen of my listview if someone can help me!I'm workin on a wpf c# solution and I want to w