using System;
using System.Collections.Generic;
using System.Linq;
public class Test
{
public static void Main()
{
List<string> _strImportFields = new List<string> {"1","2","5","6"};
List<string> _strImportFields2 = new List<string> {"1","2","3","4"};
var items = _strImportFields.Except(_strImportFields2);
foreach(var item in items) Console.WriteLine(item);
}
}
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