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    <p>Okay, so first of all, you're going to need to store something else in <code>lstStock.</code> I'd suggest something like this:</p> <pre><code>public class StockItem { public string Name { get; set; } public int Count { get; set; } } </code></pre> <p>Next, I'd suggest that you don't use the <code>.Items</code> field as the actual container where you're storing your stock items. Instead, I'd have a <code>List&lt;StockItem&gt;</code> that you use to populate <code>lstSupply</code> when you refresh.</p> <pre><code>private List&lt;StockItem&gt; _items = new List&lt;StockItem&gt;(); </code></pre> <p>Then, when you click "add", you do two things:</p> <ol> <li><p>Iterate through <code>_items</code> to see if there is already a stock item in there of the matching supply. Create one, and add it, if it does not exist.</p></li> <li><p>Find the matching stock item in <code>_items</code> and increment its <code>Count</code>.</p></li> </ol> <p>To get it to display the way you'd like, we can override <code>ToString()</code> in our <code>StockItem</code> class.:</p> <pre><code>public class StockItem { public string Name { get; set; } public int Count { get; set; } public override string ToString() { if (Count &gt; 1) return Name + " x" + Count; return Name; } } </code></pre> <p>Finally, whenever any changes are made, you simply re-populate <code>lstStock</code>:</p> <pre><code>private void RefreshGui() { lstStock.Items.Clear(); lstStock.Items.AddRange(_items.ToArray()); } </code></pre> <p>There are plenty of other ways of going about this, but for this simple exercise, this is how I think I would do it.</p>
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    1. USJonathon Reinhart
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    1. CODo i need to add some codes in the get and set? Because the lstStock is blank after i click the Add button
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      1. USYi Xu Chee
    2. CO`public int Count { get; set; }` is an [Auto-Implemented Property](http://msdn.microsoft.com/en-us/library/bb384054.aspx) - you don't need any code, it adds an invisible backing-field. You'll need to set `Name` when you create a the StockItem. You can do it like this: `new StockItem() { Name = "somename" };`
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      1. USJonathon Reinhart
    3. COSo where do i insert the line new StockItem() { Name = "somename" };? i am new and just learning
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