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copied!<p>Not sure if this is what you are getting at because your question is difficult to understand and it appears that your example data may contain a couple of typos. However, I modeled something similar for you below. Note I changed Row 1 because it looks like you had a typo, and I changed Row 5 so it would actually be an excluded case, otherwise you would have gotten everything.</p> <pre><code>public class Test { public int Row {get; set;} public int ID {get; set;} public string Match {get; set;} public string Value {get; set;} public int Equal {get; set;} public int Group {get; set;} } void Main() { var items = new List<Test>(); items.Add(new Test() {Row = 1, ID = 1, Match = "a", Value = "a", Equal = 1, Group = 1}); items.Add(new Test() {Row = 2, ID = 1, Match = "a", Value = "b", Equal = 0, Group = 1}); items.Add(new Test() {Row = 3, ID = 2, Match = "a", Value = "a", Equal = 1, Group = 2}); items.Add(new Test() {Row = 4, ID = 3, Match = "b", Value = "c", Equal = 0, Group = 3}); items.Add(new Test() {Row = 5, ID = 4, Match = "a", Value = "b", Equal = 1, Group = 4}); var result = items.GroupBy(i => i.Group) .Where(g => g.All(t => (t.Equal == 1 && t.Match == t.Value) || (t.Equal == 0 && t.Match != t.Value))) .SelectMany(g => g.Select(i => i)); foreach (var i in result) { Console.WriteLine("Row: {0}, ID: {1}", i.Row, i.ID); } } </code></pre> <p>Result:</p> <pre><code>Row: 1, ID: 1 Row: 2, ID: 1 Row: 3, ID: 2 Row: 4, ID: 3 </code></pre>

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