Unable to access webmethod on aspx.cs page

Question

I am trying to call a webmethod with jquery ajax. However, the call returns a Not Found error. Trying to access the method directly via the URL also returns a 404 error.

I made sure to add EnablePageMethods="true" parameter to the <asp:ToolkitScriptManager> on the master page.

Announcements.aspx:

<script type="text/javascript">
    $(function () {
        $("#CreateBtn").click(function () {
            var announce = {};
            announce["title"] = "An Announcement";
            announce["body"] = "Announcement Body";

            $.ajax({
                type: "POST",
                url: "Announcements.aspx/AddAnnouncement",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                data: JSON.stringify(announce),
                success: function () {
                    alert("success!");
                },
                error: function (x, t, e) {
                    alert(t); //alerts "error"
                    alert(e); //alerts "Not Found"
                }
            });
            return false;
        })
    });
</script>

Announcements.aspx.cs

using System.Web.Services;

namespace MyProject.ContentTools
{   
public partial class Announcements : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    [WebMethod]
    public static string AddAnnouncement(string title, string body)
    {
        var newTitle = title;
        var newBody = body;

        return "it worked!";
    }
}
}

This is a resting service right? If so try [WebGet(UriTemplate = "Announcements.aspx/AddAnnouncement/{args=null}")] in place of WebMethod — Eric Thomas, Oct 07 '15 at 16:18
@Viru - No it's not required, `WebMethod` is not a method it is an attribute. — Rahul Singh, Oct 07 '15 at 16:18
I just realized its a post, saw a return and got confused. In that case you can try [WebInvoke](https://msdn.microsoft.com/en-us/library/system.servicemodel.web.webinvokeattribute(v=vs.110).aspx). So it would like [WebInvoke(Method = "POST", UriTemplate = "Announcements.aspx/AddAnnouncement")] — Eric Thomas, Oct 07 '15 at 16:28
One the line above [WebMethod] try adding [System.Web.Script.Services.ScriptMethod()] — jgok222, Oct 07 '15 at 16:28
Just for curiosity, try removing second parameter, so that you have only text sent to the web method, and see if that works — Andrei, Oct 07 '15 at 16:38
One more thing - do you use any kind of url rewriting? If yes, that might be another problem — Andrei, Oct 07 '15 at 17:00
You could try to get it working without any input parameters as in http://stackoverflow.com/questions/6928533/calling-a-webmethod-with-jquery-in-asp-net-webforms to make sure the call (url, etc) itself is actually OK. — schudel, Oct 07 '15 at 18:13
@RahulSingh I do know WebMethod is not method but a attribute...parenthesis in attributes is used to provide positional or named parameters..Anyway, OP has confirmed it does not work.... — Viru, Oct 07 '15 at 18:45
Your web method looks correct. can you show the ASPX code for the element with id `CreateBtn` ? May be the ajax code is not getting called because if you don't have `ClientIdMode='static'` in div element then the id will be prefixed with some other string then the click will not work. — J Santosh, Oct 07 '15 at 18:47

Dusty · Answer 1 · 2015-10-07T18:42:23.237

If you are using PageMethods from within an ASP.NET MVC project, you probably need to ignore the routes for aspx pages (and, therefore, the PageMethod urls that are based on them). In your route registration (usually at App_Start/RouteConfig.cs), add the following line:

routes.Ignore("{*allaspx}", new { allaspx = @".*\.aspx(/.*)?" });

This should allow the PageMethod request to go through without interference from MVC routing.

score 0 · Answer 2 · answered Oct 10 '15 at 05:08

i'm not sure about the 404 problem exactly, but a couple other things:

you're using <asp:ToolkitScriptManager>. this should be a <asp:ScriptManager> (makes a difference??);
if using jquery's ajax, i think the <asp:ScriptManager> is not even required;

score 0 · Answer 3 · edited Apr 14 '16 at 16:49

Try this..You have to add ScriptMethod notation in your method...

[WebMethod]    
 [ScriptMethod(ResponseFormat = ResponseFormat.Json)]  
        public static string AddAnnouncement(string title, string body)
        {
            var newTitle = title;
            var newBody = body;

            return "it worked!";
        }
and in your ajax method try to change data format.

    $.ajax({
                    type: "POST",
                    url: "Announcements.aspx/AddAnnouncement",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    data: JSON.stringify(title: announce.title, body: announce.body),
                    success: function () {
                        alert("success!");
                    },
                    error: function (x, t, e) {
                        alert(t); //alerts "error"
                        alert(e); //alerts "Not Found"
                    }
                });

score -2 · Answer 4 · answered Oct 07 '15 at 18:54

Try this..You have to call PageMethods like below in your jquery..

<script type="text/javascript">
    $(function () {
        $("#CreateBtn").click(function () {

            var title = "An Announcement";
            var body = "Announcement Body";
             PageMethods.AddAnnouncement(title,body,success,error);
        function success(result) {
                    alert("success!");
                }
        function error(result) {
                    alert(result); 
                }
            });
            return false;
        })
    });
</script>

Unable to access webmethod on aspx.cs page

4 Answers4