public static StringWriter RootWriter(this ControllerContext context, bool createIfNotExists = true)
{
var writer =
createIfNotExists ?
context.ActionData(true).AddOrGetExisting("UpdatePanels.Renderer", () => new StringWriter())
: context.ActionData(true).TryGetValue("UpdatePanels.Renderer", null as StringWriter)
;
return(writer);
}