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copied!<p>Pure .NET 2.0 (No extensions! No LINQ! No RegEx! No unnecessary WebControl class!). These methods are quite general to be used not for CSS classes only.</p> <pre><code>public static string AddCssClass(string classContainer, string className) { if (string.IsNullOrEmpty(classContainer)) return className ?? string.Empty; if (string.IsNullOrEmpty(className)) return classContainer; var classNames = classContainer.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); if (Array.Exists(classNames, delegate(string s) { return s.Equals(className); })) return classContainer; return classContainer + " " + className; } public static string RemoveCssClass(string classContainer, string className) { if (string.IsNullOrEmpty(classContainer)) return className ?? string.Empty; if (string.IsNullOrEmpty(className)) return classContainer; var classNames = classContainer.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); int index = Array.FindIndex(classNames, delegate(string s) { return s.Equals(className); }); if (index >= 0) { return string.Join(" ", classNames, 0, index) + ( index + 1 < classNames.Length ? " " + string.Join(" ", classNames, index + 1, classNames.Length - index - 1) : string.Empty ); } return classContainer; } public static string ToggleCssClass(string classContainer, string className) { if (string.IsNullOrEmpty(classContainer)) return className ?? string.Empty; if (string.IsNullOrEmpty(className)) return classContainer; var classNames = classContainer.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); if (Array.Exists(classNames, delegate(string s) { return s.Equals(className); })) return RemoveCssClass(classContainer, className); return classContainer + " " + className; } </code></pre>

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