System.Web.UI.WebControls.DropDownList.AddAttributesToRender C# (CSharp) Method

		protected override void AddAttributesToRender(HtmlTextWriter writer)
		{
			if (Page != null)
				Page.VerifyRenderingInServerForm (this);
#if NET_2_0
			if (writer == null)
				return;
			if (!String.IsNullOrEmpty (UniqueID))
				writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID, true);

			if (!IsEnabled && SelectedIndex == -1)
				SelectedIndex = 1;
#else
			writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID, true);
#endif
			if (AutoPostBack) {
#if NET_2_0
				string onchange = Page.ClientScript.GetPostBackEventReference (GetPostBackOptions (), true);
				onchange = String.Concat ("setTimeout('", onchange.Replace ("\\", "\\\\").Replace ("'", "\\'"), "', 0)");
				writer.AddAttribute (HtmlTextWriterAttribute.Onchange, BuildScriptAttribute ("onchange", onchange));
#else
				writer.AddAttribute (HtmlTextWriterAttribute.Onchange,
						     BuildScriptAttribute ("onchange", Page.ClientScript.GetPostBackClientHyperlink (this, "")));
#endif
			}

			base.AddAttributesToRender(writer);
		}