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

		protected override void AddAttributesToRender (HtmlTextWriter writer)
		{			
			Page page = Page;
			if (page != null)
				page.VerifyRenderingInServerForm (this);
			
			writer.AddAttribute (HtmlTextWriterAttribute.Type, "image", false);
			writer.AddAttribute (HtmlTextWriterAttribute.Name, UniqueID);

			base.AddAttributesToRender (writer);
#if NET_2_0
			string onclick = OnClientClick;
			if (!String.IsNullOrEmpty (onclick))
				onclick = ClientScriptManager.EnsureEndsWithSemicolon (onclick);
			else
				onclick = String.Empty;
			
			if (HasAttributes && Attributes ["onclick"] != null) {
				onclick = ClientScriptManager.EnsureEndsWithSemicolon (onclick + Attributes ["onclick"]);
				Attributes.Remove ("onclick");
			}
			
			if (page != null)
				onclick += GetClientScriptEventReference ();
			
			if (onclick.Length > 0)
				writer.AddAttribute (HtmlTextWriterAttribute.Onclick, onclick);
#else
			if (CausesValidation && page != null && page.AreValidatorsUplevel ()) {
				ClientScriptManager csm = new ClientScriptManager (page);
				writer.AddAttribute (HtmlTextWriterAttribute.Onclick, csm.GetClientValidationEvent ());
				writer.AddAttribute ("language", "javascript");
			}
#endif
		}