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copied!<p>You don't have to guess about run-times or versions, just use this CaseInsensitiveStringComparer class that I made in my spare time (you can pass it to the constructor of the dictionary or if you are using .NET 3.5, a HashSet):</p> <pre><code>/// <summary> /// StringComparer that is basically the same as StringComparer.OrdinalIgnoreCase, except that the hash code function is improved and guaranteed not to change. /// </summary> public class CaseInsensitiveStringComparer : StringComparer { /// <summary> /// Compares two strings, ignoring case /// </summary> /// <param name="x">First string</param> /// <param name="y">Second string</param> /// <returns>Compare result</returns> public override int Compare(string x, string y) { return StringComparer.OrdinalIgnoreCase.Compare(x, y); } /// <summary> /// Checks if two strings are equal, ignoring case /// </summary> /// <param name="x">First string</param> /// <param name="y">Second string</param> /// <returns>True if strings are equal, false if not</returns> public override bool Equals(string x, string y) { return Compare(x, y) == 0; } /// <summary> /// Gets a hash code for a string, ignoring case /// </summary> /// <param name="obj">String to get hash code for</param> /// <returns>Hash code</returns> public override int GetHashCode(string obj) { if (obj == null) { return 0; } int hashCode = 5381; char c; for (int i = 0; i < obj.Length; i++) { c = obj[i]; if (char.IsLower(c)) { c = char.ToUpperInvariant(c); } hashCode = ((hashCode << 5) + hashCode) + c; } return hashCode; } } </code></pre>

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