c# - ActionResult not returning dynamic HTML -

i having problems actionresult method. in system, have simple public method returns html div message, this:

public static string divmsg(string message) {         string divmsg = string.empty;         divmsg = "<div id='error-message'>";         divmsg = string.format("{0}<p>{1}</p>", divmsg, message);         divmsg += "</div>";         return divmsg; } 

the string return placed inside viewbag, this:

viewbag.divmsg = base.utilities.divmsg("some message here."); 

the viewbag located _default.cshtml file, near @renderbody() command, , works fine in actionresult method have view associated it.

but when have no view actionresult method, this:

public actionresult integrity(int? id) { product obj = repositoryproduct.find(id); if (obj != null) {     viewbag.divmsg = base.utilities.divmsg("product found.");          return redirecttoaction("index", "products"); } else {     viewbag.divmsg = base.utilities.divmsg("product not found.");      return redirecttoaction("index", "products"); } } 

the html message not displayed on page. don't have view named "integrity" in project, , reason im using structure because call method jquery index , have little loading animation on button fires method needs interrupted after message returns, this:

$(document).ready(function () {         $('.btnintegration').on('click', function () {             var $btn = $(this).button('loading');             var idproduct = $(this).data('id');             $.ajax({                 url: '/products/integrity/' + idproduct,                 success: function (data) {                     $btn.button('reset');                 },                 error: function (data) {                     $btn.button('reset');                 }             });         })     }); 

anybody can me this? ps: sorry bad english, it's not 1st language.