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copied!<p>Just to put the topic to rest (yes, the question was posed 8 months ago, but the internet always knows!), I decided to run a little test for which is more efficient <strong><em>if</em></strong> you're pretty sure you won't have an exception -- e.g., the "else" part is going to only happen 0.001% of the time. As it turns out, if you <em>never</em> have to catch/else anything, the try-catch is about 4% faster (on my machine, anyway). Here's the code and the accompanying results:</p> <p><strong>CASE 1: if-else:</strong></p> <pre><code>var startTime = DateTime.Now; int bazillion = 100000000; int[] list = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}; for (int i = 0; i < bazillion; i++) { for (int k = 0; k < list.Length; k++) { if (k >= 0) { list[k] = i; } else { // do nothing. } } } var executionTime = DateTime.Now - startTime; Debug.WriteLine (executionTime.TotalMilliseconds); </code></pre> <p>Execution times (milliseconds) on 5 runs: 7441.4256, 7392.4228, 7545.4316, 7531.4308, 7323.4188.<br> Average = <strong>7446.82592 milliseconds</strong></p> <p><br/> <strong>CASE 2: try-catch:</strong></p> <pre><code>var startTime = DateTime.Now; int bazillion = 100000000; int[] list = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 }; for (int i = 0; i < bazillion; i++) { for (int k = 0; k < list.Length; k++) { try { list[k] = i; } catch (Exception e) { // do nothing } } } var executionTime = DateTime.Now - startTime; Debug.WriteLine(executionTime.TotalMilliseconds); </code></pre> <p>Execution times (milliseconds) on 5 runs: 7258.4152, 7137.4083, 7070.4044, 7052.4033, 7120.4073 Average = <strong>7127.8077 milliseconds</strong></p> <p><br/> <strong>Conclusion</strong> <em>(based on this rather simplistic example; actual mileage may vary, etc)</em>: <br/> In terms of sheer numbers, <em>if</em> you're pretty dang sure that the exception/else case will not occur, try-catch is about 4% faster than having to execute the "if" clause every single time.</p>

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