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    <p>I'm guessing you are using a <code>Collection</code> of <code>KeyValuePair&lt;long, long&gt;</code> and that these two values are the x and y coordinates. For settings only value, I would recommend setting the other value to <code>-1</code>. This would be fine as you are not using <code>ulong</code>.</p> <p>Say these assumptions are correct and your collection is called <code>Points</code>.</p> <p>I would recommend using <code>linq</code> where y is your desired value:</p> <pre><code> Points.Select(p =&gt; p.Value).ToArray(); </code></pre> <p>or</p> <pre><code> Points.Select(p =&gt; p.Value).ToList(); </code></pre> <p>This will return a new array or list, depending, containing all of the y values. If you needed the x values you would use <code>Key</code> instead of <code>Value</code>. As you are only grabbing the value, it doesn't matter if the <code>Key</code> (x) is null, -1 or whatever.</p> <p>Taking this a step further, you could select all of the y values, where x meets a condition. I'm guessing this would be useful to you based on your saying </p> <blockquote> <p>only one axes values (y) for some points</p> </blockquote> <p>Again, where <code>Points</code> is the collection of <code>KeyValuePair&lt;long, long&gt;</code></p> <pre><code>int example = 5; Points.Where(p =&gt; p.Key == example).Select(p =&gt; p.Value).ToArray(); </code></pre> <p>or</p> <pre><code>Points.Where(p =&gt; p.Key != -1).Select(p =&gt; p.Value).ToArray(); </code></pre> <p>Continuation(See first comment):</p> <pre><code>Queue&lt;KeyValuePair&lt;long, long&gt;&gt; queue = new Queue&lt;KeyValuePair&lt;long, long&gt;&gt;(); KeyValuePair&lt;string, Queue&lt;KeyValuePair&lt;long, long&gt;&gt;&gt; pair = new KeyValuePair&lt;string, Queue&lt;KeyValuePair&lt;long, long&gt;&gt;&gt;("test", queue); pair.Value.Enqueue(new KeyValuePair&lt;long, long&gt;(-1, 5)); </code></pre> <p>I get no problem with this code, works fine.</p> <p>Possible other solution:</p> <p>Instead of having a <code>KeyValuePair&lt;long,long&gt;</code>. You could have <code>KeyValuePair&lt;long,long[]&gt;</code>. The <code>long[]</code> would store one or two values based on your need. The only limitation would be that you would have to assume that if the array is of length one, then it is only storing <code>y</code> and not <code>x</code>, otherwise if the array is of size 2, then assume it is in an {x, y} format.</p>
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    1. COI don't have collection, this is my structure---KeyValuePair<string, Queue<KeyValuePair<long, long>>>--- and at this queue are values of x and y axes. How can i add to this queue which has KeyValuePair just value of y? I tried queue.Enqueue(new KeyValuePair<long, long>(-1, elem.Value)) but it doesn't work.
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    2. CO_I tried queue.Enqueue(new KeyValuePair<long, long>(-1, elem.Value)) but it doesn't work_. I followed this and have posted code in my answer(see Continuation). I did not get any errors with that code, runs fine. Maybe it's a syntax problem you had? Are you happy with entering -1 for `y` in the case that `x` is not needed?
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    3. COAnother option is store use `KeyValuePair<long,long[]>`. I go into more detail in my answer edit where the code is easier to read.
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