static void Main(string[] args)
            {
                List<Example> list = new List<Example>();
                list.Add(new Example() { Field1="ABC",Field2="XYZ" });
                list.Add(new Example() { Field1 = "AKL", Field2 = "AHQ" });
                list.Add(new Example() { Field1 = "ACD", Field2 = "YHG" });
                list.Add(new Example() { Field1 = "BCD", Field2 = "YFG" });
                list.Add(new Example() { Field1 = "AMD", Field2 = "YHG" });
                var result = from t in list
                             select new Example
                             {
                                 Field1 = t.Field1 == "ABC"| t.Field1 == "ACD"| t.Field1 == "BCD" ? t.Field1:" ",
                                 Field2 = t.Field2 == "XYZ"| t.Field2=="AHQ"|t.Field2=="YHG"?t.Field2:""
                             };
                foreach (var item in result)
                {
                    Console.WriteLine(item.Field1);
                    Console.WriteLine(item.Field2);
                    Console.WriteLine("******");
                }
            }