From: http://dotnetslackers.com/articles/net/Getting-started-with-Script-Sharp.aspx

TextPreviewerjQuery.cs

using System.Html;
using System.Runtime.CompilerServices;
using jQueryApi;
[Mixin("$.fn")]
public static class TextPreviewerjQueryPlugin
{
  public static jQueryObject TextPreviewerjQuery(TextPreviewerjQueryOptions options)
  {
    return jQuery.Current.Each(delegate(int i, Element element)
          {
            jQueryObject text = jQuery.FromElement(element);
            jQueryObject previewer = jQuery.Select("#" + options.PreviewerId);
            text.Keyup(delegate
                    {
                      previewer.Html(text.GetValue());
                    });
          });
  }
}
[Imported]
[ScriptName("Object")]
public sealed class TextPreviewerjQueryOptions
{
  public string PreviewerId;
  public TextPreviewerjQueryOptions()
  {
  }
  public TextPreviewerjQueryOptions(string previewerId)
  {
    PreviewerId = previewerId;
  }
}
#region Script# Support
[Imported]
public sealed class TextPreviewerjQueryObject : jQueryObject
{
  public jQueryObject TextPreviewerjQuery(TextPreviewerjQueryOptions options)
  {
    return null;
  }
}
#endregion