Sitecore.Data.Items.Item item = Sitecore.Context.Item;
if (item == null) return;
output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Style, "font-weight:bold; width:100%; clear:both");
output.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Div);
output.Write("C# Web Control Real-time Output");
output.RenderEndTag();
output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Style, "font-size:x-small; width:100%; clear:both");
output.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.Div);
output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Style, "font-weight:bold");
output.RenderBeginTag(System.Web.UI.HtmlTextWriterTag.P);
//using : for colon and   for space
output.Write("{0}: {1}", "Item", item.DisplayName);
output.RenderEndTag(); //P
if (item.Appearance.Icon != null)
output.Write("{0}: {1}", "Item Icon", "<b>" + item.Appearance.Icon + "</b><br/>");
if (Sitecore.Context.Item.Appearance.Style != null)
output.Write("{0}: {1}", "Item Style", "<b>" + item.Appearance.Style + "</b><br/>");
if (item.Appearance.ShortDescription != null)
output.Write("{0}: {1}", "Item Short Description", "<b>" + item.Appearance.ShortDescription + "</b><br/>");
if (item.Appearance.LongDescription != null)
output.Write("{0}: {1}", "Item Long Description", "<b>" + item.Appearance.LongDescription + "</b><br/>");
if (Sitecore.Context.Item.Appearance.Ribbon != null)
output.Write("{0}: {1}", "Item Ribbon", "<b>" + item.Appearance.Ribbon + "</b><br/>");
//int values (not null)
output.Write("{0}: {1}", "Item Sortorder", "<b>" + item.Appearance.Sortorder.ToString() + "</b><br/>");
//boolean values (not null) - using ? for question mark and   for space
output.Write("{0}? {1}", "Item Hidden", "<b>" + item.Appearance.Hidden.ToString() + "</b><br/>");
output.Write("{0}? {1}", "Item ReadOnly", "<b>" + item.Appearance.ReadOnly.ToString() + "</b>");
output.RenderEndTag(); //Div
Item Icon: Software/32x32/text_code_colored.png
Item Style:
Item Short Description:
Item Long Description:
Item Ribbon:
Item Sortorder: 100
Item Hidden? False
Item ReadOnly? False