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    <p>The problem you have appears to be a <code>Substring</code> operation with invalid parameters. That's the error anyway. </p> <p>What is that line of code doing in <code>buttonObradi_Click</code>? Maybe the problem you have is because of a false relative path to the file you want to open. Or the path of your exe, more likely. Like, you search for the fourth backslash and do a <code>Substring</code> from there... if your exe is in a path with less than 4 backslashes, you're in trouble :) Just an example. </p> <p><strong>EDIT</strong>: fact is, <code>Substring</code> does generate an error, and the only substring in you code is <code>grade.Substring(0, 1)</code>. So grade has to be empty. You say this happens only on some machines, so my guess is, the excell on that machine is formatted differently. As far as I can determine from the code, you parse the excell expecting the row with the <code>grade</code> to come before that with "Agent Name". This if:</p> <pre><code>else if (redak[1].ToString() == grading1 || redak[1].ToString() == grading2 || redak[1].ToString() == grading3 || redak[1].ToString() == grading4 || redak[1].ToString() == grading5 || redak[1].ToString() == grading6) </code></pre> <p>has to pass first and initialize the grade, before this line:</p> <pre><code>if (redak[1].ToString() == "Agent Name") </code></pre> <p>sets your <code>citaj</code> to true. Otherwise your <code>grade</code> variable is never initialized and of course the Substring fails.</p> <p>I hope I understood that correctly, I haven't really debugged the whole code. So I think you should check the excells on the machines this is not working, see if they are wrong or you need to adjust your code to match that formatting too. But I still don't understand why this would work from the RAR and not outside of it.... </p>
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    1. POC# win form app not working outside rar file
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    1. USIoana O
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      1. VTUpMod
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    1. COill give you +1 for pointer, but my main concern is the RAR issue, and lack of info that i cant get why the problem is occuring.
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      1. USGustav Klimt
    2. CO@GustavKlimt The **Edit** is the answer to your problem as you use `SubString` once in the button_click and the stacktrace tells us thats the error. You cant rely on apps working from RAR archives - sounds like its somehow masking the error. *BTW I'd hate to be in your shoes when management finds out you've put their secure network at risk by installing software behind their back*. Talk to them and do it properly -> add a Setup Project to your VS2010 solution and Package & Deploy the windows app correctly.
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      1. USJeremy Thompson
    3. COI dont see it, grade is initialized by "", so it does exist. It is being populated few lines after. And that never fails due it is drawing reports from report tool. If that would be the case, i belive the app would throw exception while on my desktop/laptop (without deploy/install). but that case isnt happening. I allready tryed to change SubString, but the problem still persists.
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