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    <p>You can use <a href="http://msdn.microsoft.com/en-us/library/bb460136.aspx" rel="nofollow"><code>Intersect()</code></a> to find the items that two collections have in common, and then apply <a href="http://msdn.microsoft.com/en-us/library/system.linq.enumerable.count.aspx" rel="nofollow"><code>Count()</code></a> to see if the intersection has at least three items:</p> <pre><code>var winners = players. Where(player =&gt; player.Numbers.Intersect(lotto).Count() &gt;= 3); </code></pre> <p>A couple of notes on your implementation:</p> <ul> <li>Rather than using a <code>Dictionary</code> and setting values to <code>1</code>, use a <code>HashSet</code>: you are interested in keys, not values, so a <code>Set</code> would be more appropriate</li> <li>Do not convert numbers to strings until you need to display them; searching for numbers is best done with a collection of numbers.</li> <li>If you use a set, the selection can be rewritten as follows:</li> </ul> <hr/> <pre><code>var lotto = new HashSet&lt;int&gt;(...); // put six numbers here var winners = players. Where(player =&gt; player.Numbers.Where(n =&gt; lotto.Contains(n)).Count() &gt;= 3); </code></pre> <p><strong>EDIT :</strong> (in response to an edit of the question) Your <code>Player</code> class contains player's numbers as separate attributes. You can add a way of retrieving them as a collection by adding a property <code>Numbers</code>, like this:</p> <pre><code>class Player { ... public int val0, val1, val2, val3, val4, val5, val6; public IEnumerable&lt;int&gt; Numbers { get { return new[] {val0, val1, val2, val3, val4, val5, val6}; } } } </code></pre>
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    1. POcomparing values using C# and inserting row IF true
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    1. COHow does the code know what the player numbers are...?
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    2. CO@PriceCheaperton I made an assumption that your program has some way of knowing what numbers each player has selected; it wouldn't work without that knowledge.
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    3. COI see.. So i need some sort of class to retrieve the player numbers.
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