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    <p>It would be much better implemented if you had a product struct that contained the Name and the Quantity.</p> <pre><code>struct Product { public string Name; public int Quantity; } </code></pre> <p>There's a way to fix your problem with a nested for loop and converting your arrays into a List.</p> <pre><code>List&lt;Product&gt; products = new List&lt;Product&gt;(); for(int i = 0; i &lt; listS.Length; i++) { bool duplicate = false; foreach(Product p in products) { if(listS[i].ToLower().Equals(p.Name.ToLower())) { p.Quantity += listI[i]; duplicate = true; break; } } if(!duplicate) { Product p; p.Name = listS[i]; p.Quantity = listI[i]; products.Add(a) } } </code></pre> <p>Then products will have no duplicates</p> <p>Edit: If you really want to stay with your code for thoughts that converting everything to a struct will result in a loss in performance, the fix implemented with your code will actually be very inefficient.</p> <p>The entire method can be implemented as such tho.</p> <pre><code>public void remove(string[] listS, int[] listI) { List&lt;Product&gt; products = new List&lt;Product&gt;(); for(int i = 0; i &lt; listS.Length; i++) { bool duplicate = false; foreach(Product p in products) { if(listS[i].ToLower().Equals(p.Name.ToLower())) { p.Quantity += listI[i]; duplicate = true; break; } } if(!duplicate) { Product p; p.Name = listS[i]; p.Quantity = listI[i]; products.Add(a) } } string[] lines = System.IO.File.ReadAllLines("c:\\z.txt"); for(int i = 0; i &lt; lines.Length; i++) { string[] linesSplit = lines[i].Split(' '); foreach(Product p in products) { if (linesSplit[0].ToLower().Equals(p.Name.ToLower())) { lines[i] = linesSplit[0] + " " + (int.Parse(linesSplit[1]) - p.Quantity); products.Remove(p) break; } } } System.IO.StreamWriter file = new System.IO.StreamWriter("c:\\z.txt"); file.Write(lines); file.Close(); } </code></pre>
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    1. POHow to read and write a file after receiving an array with repeated items
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    1. USDaniel Johnson
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    1. COThanks for your help, yes it would be much easier but I can't change my method's signature, because I'm using it on a web-service and it must receive two arrays :/
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    2. COok let me just adapt this real quick
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    3. COThat should work.
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