AJAX :: How To Check Asynchronous Call Using PageMethods In Global.asax Using VB.NET
May 27, 2010
I am using PageMethods in my pages, and we have some requirement in which some maintenance process happened in certain time span, so in that time we set on DB flag consider as True False, I have written my code in Global.asax where in application_AcquireRequestState(...,...) Method I am checking the flag and depanding upon the flag I am redirecting my Page to one Maintenance dummy page, so application_AcquireRequestState() method working properly when page get postback or I am using thru any server control, but when I am using Asynchronous call using PageMethods in application_AcquireRequestState I am getting exception, Can anyone solve my problem I am using VB.NET.
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Dec 8, 2010
I'm trying to install a 301 redirect where the instruction is as follows:
"In my Global.asax file (You can add this to your site from Visual Web Developer or Visual Studio by selecting File->New), In the Application_BeginRequest event, I added a call to the following code:"
The code is at bottom if needed. When it says "added a call to the following code:" does that mean something more than just putting the code inside the Application_BeginRequest section of my global.asax? For example, here's what that section looks like in my site:
[Code]....
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Oct 5, 2010
I am redirecting user from http to https if page is not secure from global.asax file in application_Begin event
But there are some pages in which i don't want to redirect to https page. I want to detect any form element which will tell me weather page should be secured or not. but when i check Requet.Form[_Viewstate] it gives me null value. Right now i check like Request.PhysicalPath.ToLower().IndexOf("test.aspx") ==-1 && !page.IsSecureConnection-> redirect to secure page but in future there will be more page which should be on http.
Is there any general way to redirect to https if page i added any hidden field on page "hfIsHttps=1" and detect that element if 1 then go other wise don't go Following is my code global.asax in application_Begin event
[code]....
I want, instead of hard core check for perticular page there should be general way, like each page itself should tell weather it should be for http or https
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Jan 12, 2011
i am new in asp.net form authentication and sessions
i would like to know how to save session in masterpage or in global.asax and how to clear session.
how to better handle session timeout by redirecting to a page.
this is my web.config session settings
<sessionState mode="InProc" cookieless="false" timeout="1"></sessionState>
code in my masterpage
[code].....
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Aug 18, 2010
I have a method in one class file with defination like this which gets the user id of logged person.
public string GetUserID(HttpRequest req)
{ .... }
I need to call this method in global.asax and save that value in session. I need to use this session value i need to use this Session value and assign that to label in Masterpage. I did not use global.asax before. And what should be the input to method... i have seen only Request is have the returntype HttpRequest. So i thought of giving that.
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Jan 24, 2011
Can I call Initialize Culture of every page from the Global.asax?
Every page looks at the query string of "?lang=##" and sets the language accordingly. Since all pages do this, is there a place where I can implement it once and all pages will load it?
My site has around 200 pages and I dont want to implement the code in everypage. Would take too long for maintenance and to implement. It would be more convinient if I could simply put it in a function that all pages call when loading.
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Mar 12, 2010
my objective is i want to log all those exceptions on my aspx pages which are handled or unhandled. To do this do i need to write my method in global.asax or how can i do that?
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Apr 23, 2010
When I run my app locally I get no errors. No error from Global.asax, no redirection to an error page. Everythings works fine.
When I deploy my app to a test server, my app run there with no errors. No error from Global.asax, no redirection to an error page. Everythings works fine on the test server.
But when I deploy my app to production server, the app runs fine but I keep getting errors (emailed to me) from Global.asax. On production server we have these security apps that run and keep hitting all URLs of the app on the server. Just to make sure they are working fine. When these security app hit URL of my app, my application runs fine but it gives out this global.asax error. The funny thing is that error is empty. The error are emailed to me and the email is empty. Nothing there.
There are several other apps running on the same server. My app has its own app pool and is configured correctly.
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Jun 30, 2012
I have tried code, but there is error...
Compilation Error:
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. Compiler Error Message: CS1525: Invalid expression term ')'
Source Error:
Line 8: <script type = "text/javascript">
Line 9: function ShowAvailability() {
Line 10: PageMethods.CheckUserName(document.getElementById("<%=txtUserName.LoginID%%>").value, OnSuccess); Line 11: }
Line 12: function OnSuccess(response) {
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Oct 1, 2010
I am using an AJAX dropdownlist control with two dropdownlist. Instead of using a webservice to populate the data, I used the pagemethod to populate. My problem is the second droplist won't populate. I get a server error, 500 in the droplist. The first droplist populates fine.
BUT here's the real kicker. If I reverse the order of the public static function such that GetHelloList2 comes BEFORE GetHelloList1 in the code, then the GetHelloList2 works ...... it just seems like it is only firing one pagemethod event and allowign only one.
[URL]
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Jan 16, 2011
I have a project that uses PageMethods to call functions on the server. The server functions (written in C#) return the values as array of strings, without doing any kind of serialization and in the client side (from Js) the accessing of the return values is by using static variable called arguments. I found that sometimes for some users (cases are not repro) sometimes an exception occured
"WebServiceFailedException the server method 'Foo' returned invalid data. the 'd' property is missing from JSON."
Some searching on google I found that people are serializing the return values using DataContractJsonSerializer class and in js accessing the return value using one of the callback function Example:
function OnRequestComplete(result,
userContext, methodName) {
var Person = eval('(' + result + ')');
alert(Person.Forename);
alert(Person.Surname); }
So is the first technique is correct? or what?
P.S:
the function on the server is defined on the default.aspx.cs file as follows:
[System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
public static string[] Foo(string s);
from the client side the calling is as follows
PageMethods.Foo("value",OnSuccess);
Also all the users have the same browser version (IE8)
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Jan 19, 2010
is it possible to call a custom method or class before accessing webmethod from pageMethods ?
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Mar 26, 2010
I'm getting a very peculiar problem with my asp.net application, it took me an age to track down but I still don't know what is causing this behaviour.
If I set a session variable in the Application_PreRequestHandlerExecute event, then my external JavaScript files are ignored, and therfore causing a raft of errors. I have simplified the problem below.
E.g.
I have file called JScript.js containing the code:
function myAlert() {
alert("Hi World");
}
And in my Default.aspx file I reference the js with the code:
<script src="JScript.js" type="text/javascript"></script>
And in the body onload event I call the myAlert() function:
<body onload="myAlert()">
And finally in the Global.asax file:
Private Sub Application_PreRequestHandlerExecute(ByVal sender As Object, ByVal e As EventArgs)
HttpContext.Current.Session("myVar") = "MyValue"
End Sub
If you run the Default.aspx file you will see the js function isnt called, however, if you comment out the line of code Global.asax then the external js is called and the function executed when the page loads.
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Feb 8, 2011
I know there is a couple answered questions on here regarding "request scoped" globals, but I want to nit-pick on something specifically and maybe squeeze some extra enlightenment out of one or two of you.I have an ASP.NET C# Website and a static Dictionary of objects (loaded from DB once on Application start). Each page request will need to do a lookup in the Dictionary (based on a key derived from the request url/etc) and get the appropriate object.The issue is I'm trying to maximize efficiency by reducing the lookups to the Dictionary per Request. Doing just a single lookup within a Page itself is easy enough and I can pass the object to sub controls, etc too.. but global.asax is separate from the Page and it also needs to use the object (in Application_BeginRequest and Session_Start).
So is doing a Dictionary lookup once in Application_BeginRequest, once (when necessary) in Session_Start and once in the Page negligible speed wise, even if there are many requests coming in every second?I would like it if I could just have a Request scoped global variable that I can easily call upon.. the only one I see available though is HttpContext.Current.Items and that is a Dictionary itself.Am I beingridiculously nit-picky with my concern over efficiency? or will these milliseconds (nanoseconds?) get me in the long run when more and more requests are being made?
PS. I currently only have around 100 objects in the Dictionary although this may increase in the future.
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Jul 16, 2012
I found this Article from link : [URL] .... that explains how to call server-side Method from javascript,
I used your code, my server-side function is static, public, and also I added
[System.Web.Services.WebMethod]
and
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
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Nov 23, 2010
Since i am fresher to .net, i m unable to handle asp.net. I have call asynchronous ajax call using XMLHTTPRequest and also use QueryString to filter Employee details.
I have following files:
1. Default.aspx code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Task2._Default" %>
<%@ Register TagPrefix="uc1" TagName="SearchResult" Src="SearchResult.ascx" %>
[code]....
3. Ajax.aspx is empty in design
what should be the code in Default.aspx.cs when u take some text in textbox to search, OnClick of "ok" button there should'nt be any postback.
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Jun 24, 2010
I am building a page with databound list control. For each row I want to display piece of info retrieved from web service call. This could be time demanding so I want to render page first and retrieved additional info asynchronously and in parallel later on. Anyone has some tips how to make it? Just to have a more detailed picture it is a product list in e-shop which I want to render so customers can use it (go to product detail/add goods to shopping cart...) but meantime there will be a placeholder displaying info that informations are retrieving which after completion of call will be replaced by result data.
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Feb 26, 2010
how can we use global.asax in asp.net? and what is that?
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Jun 20, 2010
Is it possible in the global.asax file on session_start to check if a url string exists and it it does insert the string into a sql database? The url would be something link http://www.mysite.com?campaign=january.
I would want to capture the january bit and put that in the database for each visitor that uses that url.
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Jan 27, 2010
I want to make All Methods about Error handling in asp.net some one device me at using global.asax what is global.asax?
how can i use it ?
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May 12, 2010
I have a hosting account on DailyRazor.com , i use Global.asax in my project to start a schedule process in Application_Start.When i just publish my website, and upload it, the Application_Start does not Fire, but when i upload the Global.asax to my host it gives an Error but the Applicaiton_Start Event fires up, and then i delete the Global.asax file and everything works.just wondering, What am doing wrong ? or why this meaningless thing happens?
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Nov 4, 2010
I have a site with multiple domains pointing to it. I wanted to redirect all requests to main domain so I've created a method called RedirectToRealDomain("domain.com") to check and redirect all requests to my preferred domainAt the moment it lives on Session_Start but I am planing to move it to Application_BeginRequest event. As I understand Session_Start only raised when new session started but Application_BeginRequest raised on all requests. RedirectToRealDomain method doesn't do any DB lookups or anything expensive apart from comparing strings.
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May 21, 2010
I want to set the Masterpage property in Global.asax.
This is what I have done but I get a NullReferenceException on the first line.
protected void Application_PreSendRequestContent(Object sender, EventArgs e)
{
System.Web.UI.Page page = System.Web.HttpContext.Current.Handler as System.Web.UI.Page;
if (Session["lang"] == "eng")
{
page.MasterPageFile = "SideMasterPageEng.master";
}
}
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Jun 29, 2010
I am trying to check if the user belongs to someone's friendlist from the database and redirect him accordingly.I am doing this in a routehandler called by Global Asax.I just want to know how to get the username (from the login information) in the route handler class (or Global asax)I used this: string username = HttpContext.Current.User.Identity.Name; and very strangely, its assigning ".aspx" as the username!! ps: i did search for similar question but in vain.
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Oct 19, 2010
I need replace double slashes in one slash. I am planning do this in Global.asax Application_BeginRequest event. Is it enough? or better do a http module?
UPD
Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)
' Fires at the beginning of each request
[code]...
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