How Do I Call The Method From Aspx.Cs Page Using Ajax.

Question

4.00/5 (1 vote)

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I have the code in my WebForm1.aspx as follows:

XML

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true"
    CodeBehind="WebForm1.aspx.cs" Inherits="Kaizen.UI.WEB.Kaizen2G.WebForm1" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <script>
        setInterval(function () { CheckSession(); }, 10000);

        function CheckSession() {
            debugger;
            $.ajax({
                url: 'WebForm1.aspx/CheckSession',
                type: 'POST',
                contentType: 'application/json; charset=utf-8',
                dataType: "json",
                success: function (result) {

                    if (result.d != '') {
                        alert(result.d);
                        manageOverlay(false);
                        isAdded = false;
                    }

                },
                error: function (error) {
                    manageOverlay(false);
                    alert(error.responseText);
                    isAdded = false;

                },
                async: false
            })
        };
    </script>

I have code in my .cs page as follows

C#

namespace Kaizen.UI.WEB.Kaizen2G
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.Services;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using Kaizen.Framework;

    /// <summary>
    /// The page looad
    /// </summary>
    public partial class WebForm1 : System.Web.UI.Page
    {
        /// <summary>
        /// Check User Session
        /// </summary>
        [WebMethod]
        public void CheckSession()
        {
            if (Session[KaizenConstants.CURRENTLOGGEDINUSER] == null)
            {
                Response.Redirect("Login.aspx");
            }
        }

        /// <summary>
        /// The page event
        /// </summary>
        /// <param name="sender">The Sender</param>
        /// <param name="e">The Eventsargs</param>
        protected void Page_Load(object sender, EventArgs e)
        {
        }
    }
}

on page load of aspx page i wrote this :

JavaScript

$(function () {
            try {
                debugger;
                $.ajaxSetup({
                    async: false
                });
             
                setInterval(function () { CheckSession(); }, 10000);
            }
            catch (exception) {
                manageOverlay(false);
                alert(exception);
            }
        });

Now when i am calling method from ajax i am getting the error as follows.
500(internal Server Error)

why is it so .
please guide me .
i want to call the method from WebForm1.aspx.cs

Thanks
Harshal

Posted 8-May-14 3:45am

R Harshal

Updated 8-May-14 5:22am

Abhishek Pant

v4

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Comments

R Harshal 8-May-14 10:16am

Anyone can help me please ..

FluffySaysNo 8-May-14 10:45am

your webmethod must be static, otherwise it is not accessible outside of the server context of the page. This context drops after the initial page life cycle events for loading the page. This link will fully explain the "Why?" : http://encosia.com/why-do-aspnet-ajax-page-methods-have-to-be-static/

FluffySaysNo 8-May-14 12:46pm

Don't forget to mark an answer if it answers, or leads you to an answer for, your question. ;D

1 solution

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FluffySaysNo · Accepted Answer · 2014-05-08T05:53:00

Solution 1

Change :

C#

/// <summary>
/// Check User Session
/// </summary>
[WebMethod]
public void CheckSession()
{
    if (Session[KaizenConstants.CURRENTLOGGEDINUSER] == null)
    {
        Response.Redirect("Login.aspx");
    }
}

to

C#

/// <summary>
/// Check User Session
/// </summary>
[WebMethod]
public static AjaxResponse<bool> CheckSession()
{
    AjaxResponse<bool> oResponse = new AjaxResponse<bool>();

    oResponse.Data = Session[KaizenConstants.CURRENTLOGGEDINUSER] == null;

    return oResponse
}

Link : Why do asp.net ajax page methods have to be static?

This is a general container class

C#

public class AjaxResponse<T>
{
   /// <summary>
   /// Constructor
   /// </summary>

   public AjaxResponse()
   {
      Status   = ResponseStatus.OK.ToString();
      ErrorMsg = "";
   }

   public string Status    { get; set; }
   public string ErrorMsg  { get; set; }
   public T      Data      { get; set; }
}

success: function (result) {

    if (result.d != '')
        result = result.d
    if (result.Data == 'True') {
        /* Session has timed out, or user was not logged in */
    }

}

Posted 8-May-14 5:53am

FluffySaysNo

Updated 8-May-14 6:28am

v3

Comments

R Harshal 8-May-14 11:56am

yeah but its give me error as follows:

Error 45 An object reference is required for the non-static field, method, or property 'System.Web.UI.Page.Session.get' G:\Quantum IndiaProjects\Code\Kaizen.UI\Kaizen.UI.WEB\Kaizen2G\WebForm1.aspx.cs 32 17 Kaizen.UI.WEB

I have tried this but its give me error.,Kindly help
Thanks
Harshal

FluffySaysNo 8-May-14 12:00pm

hmm. You will need to use a different route to access the session... Maybe HttpContext.Current.Session[KaizenConstants.CURRENTLOGGEDINUSER] will work for you

FluffySaysNo 8-May-14 12:02pm

Also, changing [WebMethod] to [WebMethod(EnableSession = true)] should help if the session is not available this way

R Harshal 8-May-14 12:16pm

Please help Fluffy ..

R Harshal 8-May-14 12:16pm

for session its work and what about for Response.Redirect .I am getting the same error .

R Harshal 8-May-14 12:15pm

for session its work and what about for Response.Redirect .I am getting the same error .
Please help ..

FluffySaysNo 8-May-14 12:24pm

Your client code will have to handle the redirection, not your server code. It doesn't have a reference to the page, so it cannot redirect from or to it, given it is static. You should pass back a bool value that tells the javascript to either continue or transfer to login page.

I have updated my answer to reflect this process

R Harshal 8-May-14 12:24pm

i am fresher in this .Please let me know what changes i need to do in my code .Please Fluffy.
Thankful
harshal

R Harshal 8-May-14 12:27pm

should is there any other way ,its getting difficult for me .
thanks
Harshal

FluffySaysNo 8-May-14 12:30pm

Sorry, no, there really is no other way that is as effective as this. Once you have a good foundation set in place, this process really does get easier and more manageable. I've given you about as much as I can without doing the programming for you. Each step is there between your original code and my updated answer

R Harshal 8-May-14 12:36pm

its true ..no worries .
Thank you so much .. for helping ..

FluffySaysNo 8-May-14 12:42pm

You are welcome. Just take some time to get associated with the code, I promise it will come together and get easier as you get more acclimated to the process. :)

R Harshal 9-May-14 3:32am

I got the another solutions :
its simple .
we need to modify this
HttpContext.Current.Response.Redirect("Login.aspx");
instead of
Response.Redirect("Login.aspx");

thanks
Harshal

FluffySaysNo 14-May-14 9:09am

Wow.. I cannot believe I missed something that simple!! this may actually simplify my coding practices, thank you!