Pastable version of ASP.NET CSS classes

<pre class='prettyprint' language='cs'>public static void CssAddClass(this Control control, string className)
    { 
        if (control == null)
        {
            throw new ArgumentNullException(&quot;control&quot;);
        }
 
        if (className == null)
        {
            throw new ArgumentNullException(&quot;className&quot;);
        }
 
        string classAttributeValue;
 
        if (control is WebControl)
        {
            classAttributeValue = (control as WebControl).CssClass;
        }
        else if (control is HtmlControl)
        {
            classAttributeValue = (control as HtmlControl).Attributes[&quot;class&quot;];
        }
        else
        {
            throw new ArgumentException
                (&quot;Must be WebControl or HtmlControl.&quot;, &quot;control&quot;);
        }
 
        if (string.IsNullOrEmpty(classAttributeValue))
        {
            classAttributeValue = className;
        }
        else
        {
            var classNameList = classAttributeValue.Split
                (new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
 
            if (classNameList.Contains(className))
            {
                return;
            }
 
            classAttributeValue = string.Concat
                    (classNameList.Select(name =&gt; name + &quot; &quot;).ToArray()) + className;
        }
 
        if (control is WebControl)
        {
            (control as WebControl).CssClass = classAttributeValue;
        }
        else if (control is HtmlControl)
        {
            (control as HtmlControl).Attributes[&quot;class&quot;] = classAttributeValue;
        }
    }
 
    public static void CssRemoveClass
        (this Control control, string className, bool mayNotExist)
    {
        if (control == null)
        {
            throw new ArgumentNullException(&quot;control&quot;);
        }
 
        if (className == null)
        {
            throw new ArgumentNullException(&quot;className&quot;);
        }
 
        string classAttributeValue;
 
        if (control is WebControl)
        {
            classAttributeValue = (control as WebControl).CssClass;
        }
        else if (control is HtmlControl)
        {
            classAttributeValue = (control as HtmlControl).Attributes[&quot;class&quot;];
        }
        else
        {
            throw new ArgumentException
                (&quot;Must be WebControl or HtmlControl.&quot;, &quot;control&quot;);
        }
 
        bool isNullOrEmpty = string.IsNullOrEmpty(classAttributeValue);
 
        if (!mayNotExist &amp;&amp; isNullOrEmpty)
        {
            throw new ArgumentException
                (&quot;Does not have any CSS classes defined.&quot;, className);
        }
        else if (isNullOrEmpty)
        {
            classAttributeValue = string.Empty;
        }
 
 
        var classNames =
            from name in classAttributeValue.Split
                (new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
            where name != className
            select name + &quot; &quot;;
 
        classAttributeValue = string.Concat(classNames.ToArray()).TrimEnd();
 
        if (control is WebControl)
        {
            (control as WebControl).CssClass = classAttributeValue;
        }
        else if (control is HtmlControl)
        {
            (control as HtmlControl).Attributes[&quot;class&quot;] = classAttributeValue;
        }
    }</pre>
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Pastable version of ASP.NET CSS classes