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    <p>I'm going to hazard a guess here, since you haven't given us enough to really give you a solid answer.</p> <p>I bet the problem is the parsing of that line part, this expression:</p> <pre><code>int.Parse(line.Split(',')[0]) </code></pre> <p>That this doesn't, in all cases, actually give you a number.</p> <p>So you should look at the file, and possibly change the code to this:</p> <pre><code>string[] parts = line.Split(','); ... int.Parse(parts[0]) ... </code></pre> <p>Then you can inspect the contents of that array to see what is really in that first column.</p> <p>As noted in the comments, a better approach would be to not blindly assume the parsing will succeed, and additionally you would probably want to ensure you're using the right cultural information.</p> <p>Here's what I would do, assuming the numbers are output by a program, for reading into another program:</p> <pre><code>int value; if (Int32.TryParse(parts[0], NumberStyles.Integer, CultureInfo.InvariantCulture, out value)) ... your code here, use value where you need it else what to do in the case of unable to parse the string as a number </code></pre> <p>On a hunch, do you need to trim the contents? Try this simple change:</p> <pre><code>... int.Parse(line.Split(',')[0].Trim()) ... ^--+--^ | +-- add this </code></pre> <p>Other tips:</p> <ul> <li><p>Use <code>Path.Combine</code> to combine paths:</p> <pre><code>new FileStream(Path.Combine(installPath, "storedUsers.txt") </code></pre></li> <li><p>Rewrite your reading loop to this:</p> <pre><code>string line; while ((line = userStream.ReadLine()) != null) { ... } </code></pre></li> <li><p>Use the <code>using</code> clause for disposing of your stream:</p> <pre><code>using (FileStream userFile = new FileStream(...)) { ... } // delete the .Close() line, this is handled by the } on the preceeding line </code></pre></li> </ul> <p>Final version:</p> <pre><code>installPath = @"C:\Program Files (x86)\MyApp\"; using (FileStream userFile = new FileStream( Path.Combine(installPath, "storedUsers.txt"), FileMode.OpenOrCreate, FileAccess.Read)) using (StreamReader userStream = new StreamReader(userFile)) { string line; while ((line = userStream.ReadLine()) != null) { string[] parts = line.Split(','); int userId; if (Int32.TryParse(parts[0], NumberStyles.Integer, CultureInfo.InvariantCulture, out userId)) storedUsers.Add(userId); } } </code></pre> <p>Of course, if the file isn't too big, you can rewrite the whole shebang using a bit of LINQ:</p> <pre><code>// warning, LINQ with side-effects, evaluate here, don't use it lazily int tempUserId = 0; List&lt;int&gt; userIds = File .ReadAllLines(Path.Combine(installPath, "storedUsers.txt")) .Select(l =&gt; l.Split(',')[0]) .Where(p0 =&gt; Int32.TryParse(p0, NumberStyles.Integer, CultureInfo.InvariantCulture, out tempUserId)) .Select(dummy =&gt; tempUserId) .ToList(); </code></pre>
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    1. POTrying to open a file, wrong format?
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    1. USLasse Vågsæther Karlsen
    1. USLasse Vågsæther Karlsen
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    1. CO+1 - even though I would suggest using `int.TryParse` instead.
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      1. USFredrik Mörk
    2. COYeah, that's better, I was aiming at adding a quick answer first, and then expanding it :)
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      1. USLasse Vågsæther Karlsen
    3. CO+1 for `Path.Combine` - a lot don't use it.
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      1. USLasse Espeholt
 

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