ASP.NET jQuery error: Unknown Web Method

Question

This is my first time attempting to call an ASP.NET page method from jQuery. I am getting a status 500 error with the responseText message that the web method cannot be found. Here is my jQuery $.ajax call:

function callCancelPlan(activePlanId, ntLogin) {
    var paramList = '{"activePlanId":"' + activePlanId + '","ntLogin":"' + ntLogin + '"}';
    $.ajax({
        type: "POST",
        url: "ArpWorkItem.aspx/CancelPlan",
        data: paramList,
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function() {
            alert("success");
        },
        error: function(xml,textStatus,errorThrown) {
            alert(xml.status + "||" + xml.responseText);
        }
    });
}

And here is the page method I am trying to call:

[WebMethod()]
private static void CancelPlan(int activePlanId, string ntLogin)
{
    StrategyRetrievalPresenter presenter = new StrategyRetrievalPresenter();
    presenter.CancelExistingPlan(offer, ntLogin);            
}

I have tried this by decorating the Web Method with and without the parens'()'. Anyone have an idea?

DDA · Accepted Answer · 2014-03-19 18:19:50Z

101

Your web method needs to be public and static.

edited Mar 19, 2014 at 18:19

DDA

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answered Oct 7, 2008 at 19:23

tvanfosson

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4 Comments

Max Over a year ago

Your web method needs to be declared as "static"

tvanfosson Over a year ago

@Max -- correct, it needs to be both public and static, though in this question it already was static.

Max Over a year ago

I was just guessing that Victor's problem was forgetting the static.

Stephen Kennedy Over a year ago

Note that is not true for web methods in an asmx, where they have to be public and not static. See stackoverflow.com/questions/4543347/… and stackoverflow.com/questions/3158678/…

Cory House · Accepted Answer · 2011-05-05 13:37:08Z

12

Clean the solution and rebuild. I've seen webmethods throw 500's until you do this.

answered May 5, 2011 at 13:37

Cory House

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Comments

Legends · Accepted Answer · 2016-12-27 06:38:23Z

3

Add public static before your method...

ex.

[WebMethod]
public static string MethodName() {}

edited Dec 27, 2016 at 6:38

Legends

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answered Jul 24, 2013 at 15:02

Tukaram

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Comments

JustSomeGuyInWorld · Accepted Answer · 2021-04-08 07:31:31Z

1

For ajax success:

For me, it was helpful to make:

App_Start\RouteConfig

set from

settings.AutoRedirectMode = RedirectMode.Permanent;

to

settings.AutoRedirectMode = RedirectMode.Off;

make your using method:

public

static

add:

using System.Web.Services;

and on top of method using just:

[WebMethod]

is enough

answered Apr 8, 2021 at 7:31

JustSomeGuyInWorld

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Comments

Priyank Raunak · Accepted Answer · 2022-04-05 15:08:22Z

0

First Of All Don't Forget To Include using System.Web.Services;

And Make Sure Your Method Should Be Public And Static and avoid adding Multiple Scripts in same Page like jquerymin.js shouldn't be used for every Function/Method in same Page

[WebMethod] public static sting MethodName(){}

I Had The Same Issue Which Using Ajax And Jquery To Check Username Exists Or Not.

answered Apr 5, 2022 at 15:08

Priyank Raunak

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