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copied!<p>I think your question has been answered. My reply goes beyond the immediate question and more to the spirit of the exercise. I remember having this task many decades ago in college, when memory and mainframe (yikes!) processing time was at a premium. Our task was to reverse an array or string, which is an array of characters, without creating a 2nd array or string. The spirit of the exercise was to teach one to be mindful of available resources. </p> <p>In .NET, a string is an immutable object, so I must use a 2nd string. I wrote up 3 more examples to demonstrate different techniques that may be faster than your method, but which shouldn't be used to replace the built-in .NET Replace method. I'm partial to the last one.</p> <pre><code> // StringBuilder inserting at 0 index public static string Reverse2(string inputString) { var result = new StringBuilder(); foreach (char ch in inputString) { result.Insert(0, ch); } return result.ToString(); } // Process inputString backwards and append with StringBuilder public static string Reverse3(string inputString) { var result = new StringBuilder(); for (int i = inputString.Length - 1; i >= 0; i--) { result.Append(inputString[i]); } return result.ToString(); } // Convert string to array and swap pertinent items public static string Reverse4(string inputString) { var chars = inputString.ToCharArray(); for (int i = 0; i < (chars.Length/2); i++) { var temp = chars[i]; chars[i] = chars[chars.Length - 1 - i]; chars[chars.Length - 1 - i] = temp; } return new string(chars); } </code></pre>

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