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    <p>The issue is that you are "capturing" <code>initargs</code> via the use of the lambda expression.</p> <p>You shouldn't be reusing <code>initargs</code> in this way. Your code will be more readable and easier to maintain, and you will avoid this problem.</p> <p>So, first, use two different instances of <code>initargs</code>:</p> <pre><code>string initArgsWithScaleTwo = // ThreadPool.QueueUserWorkItem(o =&gt; pt.callExecute(initArgsWithScaleTwo)); string initArgsWithScaleFour = // ThreadPool.QueueUserWorkItem(o =&gt; pt.callExecute(initArgsWithScaleFour)); </code></pre> <p>Second, there's a lot of needless repetition when you assign to <code>initArgs</code>. That's not fun to maintain. This should get you started on a clearer version:</p> <pre><code>private string GetInitArgs( string filePath, int scale, int newHeight, string vidPathHigh, int scanLines ) { return "-i " + filePath + String.Format(" -vcodec wmv2 -qscale {0} -s ", scale) + newHeight + String.Format("x{0} -acodec wmav2 -ar 44100 -ab 128k -y \"" + pt.vidPathHigh + "\"", scanLines); } </code></pre> <p>You can do more and use <code>String.Format</code> to really clean the whole thing up.</p> <p>Then you can say</p> <pre><code>string initArgsWithScaleTwoAnd480ScanLines = GetInitArgs( pt.filePath, 2, (int)Math.Floor(480 * aspectRatio, pt.vidPathHigh, 480 ); </code></pre> <p>All that said, I don't understand why you are using threads at all if the threads are merely starting new processes. Just start the processes directly, and wait for them all to finish.</p>
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    1. COThank you! It worked, i should've looked back to my lessons in school pass by value pass by reference.... And thanks for the warning i lost my self when i'm trying to debug this so i just wrote the worst code i could ever.. I will definitely fix this! Cheers!
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    2. CO@umutto: To be very clear: the issue here is not, Not, NOT pass by reference. You aren't passing parameters by reference. The issue is that you had used `initArgs` in a lambda expression. Therefore, it was "captured." This means the compiler created a class for you, lifted `initArgs` as a field to that class. Then, it created an instance of that class for you. And that's the key, it only created one instance and every invocation to queue a new thread was seeing the same instance. So, your threads were all sharing the same instance of this compiler generated class. Clear?
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    3. COYes sir, thanks again for removing the clouds about lambda expression, this info actually helped me more now that i can edit wisely. Cheers.
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