Best Practice When Using WebMethods And Session?
May 15, 2010
I want to reduce postback in one of my application page and use ajax instead. I used the WebMethod to do so.. I have a static WebMethod that needs to access the session variables and modify. and on the client side, i am calling this method using jQuery. I tried accessing the session as follows:
[WebMethod]
public static void TestWebMethod()
{
[code]...
The values are displayed correctly and seems to work.. but i would like to know if this practice is allowed as the method is a static methods and would like to know how it will behave if multiple people access the application.I would also like to know how developers do these kind of tasks in ASP if this is not the right method.
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Sep 14, 2010
I have the following code to store session variable in one webmethod and retrieve it in other webmethod but the value displays null when i try to retrieve it.
[WebMethod(EnableSession = true)]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public bool SubmitList1(string businessname )
{
Session["Company_Name"] = businessname;
SqlConnection con = new SqlConnection();
.......
.........
.........
}
This will be my second webmethod where i am trying to retrieve the session variable
[WebMethod(EnableSession = true)]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public bool addresslisting()
{
string companyname = (string)Session["Company_Name"];// this particular value is displaying null
......
........
}
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Dec 3, 2010
The intent is to create a set of web services that people can reuse. These services mostly interact with a backend DB creating, retreiving and processing data. We want to expose services so that people can use to create data mashups and other applications.End users are webpages that can be within our domain or outside our domain. For pages outside the domain we plan to release widgets that would be configured to retreive and display the data.
One requirement - application should be extremely scalable in terms of the number of users it can handle.Our code base is .net and we are looking at ASPX webmethods (or ASHX), ASMX webmethods and WCF (starting to read up on WCF). In terms of security/access I found that maintaining sessionid, memberships is doable in all three. WCF seems a bit complicated to setup. I could not immediately see the value of asmx when we can get all done just using a webmethod in aspx (with a little tweaking). Also, assuming that with the ASP.NET MVC2 I might be able to get clean urls as well for these webmethods.QuestionsWhich one will be the most effective in terms of performance and scalability? Any reason why I should choose WCF or ASMX?
EDIT I kind of understand that WCF is the way to go. Just to understand the evolution of the technologies it would be good if someone can throw light on why a aspx webmethod is different from an asmx when similar things (apart from discovery) can be accomplished by both. The aspx webmethods can be made to return data in other formats (plaintext, json). Also, it seems that we can build restful services using ashx.
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Apr 12, 2010
We're creating a new consumer/public-facing ASP.Net web app. There are two concerns:
--Use cookie or cookieless forms authentication?
--If we decide not to use cookies at all, how would you store the data that would otherwise be stored in the cookie (Customer ID, AffiliateID, etc.). Does the ASP.Net authentication framework track something like CustomerID?
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Mar 7, 2011
It's not explicitly written somewhere but I felt so after reading few blogs on ASP.NET MVC. Just got curious and thought of asking it here.
UPDATE: I'm not asking about memory/storage/RAM concerns on server. For them, there is a solution to store session out of process. I know that. I'm curious that, are there any scenarios where we had to use Session in WebForms but we can avoid it now in MVC taking benefit of the nice structured way offered by MVC?
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Apr 14, 2010
I need regarding best practice for asp.net session management without using membership. I have design a login page which has two Text boxes and a Login Button. I need a again best practice which authenticate user and save user information in session. So in main page after login I want to check either session is expire or not. I need an complete example. Further more I am using ASP.NET 3.5.
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Jul 17, 2010
i have deployed my website on a particular server. i have some limitations in using viewstate and session variables.
those pages in which i have used ViewState variables (for storing some information), i user accesses that page and does not do any activity for 5 minutes and if after 5 minutes he does any kind of activity (click on Link or button etc) then he receives following error:
"Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster."
another problem is with session. My session expires just after 2-3 minutes. What should i do for maintaining session for long time? i can not use cookies, as if user has disabled the cookies then my website will not work...
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Dec 5, 2010
calling a SAP Webmethod using ASP.NET application.
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Nov 22, 2010
I have a webservice (using asp.net VS 2008).If I have two webmethods with same name but different input parameters and same output parameters. Just like given below. Can't I have two webmethods with same name with different parameters?
Code:
[WebMethod]
public Portfolio GenerateData(string As_of_Date, bool PortfolioLoadfromArchive)
{
Portfolio aPortfolio = null;
[code]...
Both TestProj.WebServices.Portfolio GenerateData(System.String) and TestProj.WebServices.Portfolio GenerateData(System.String, Boolean) use the message name 'GenerateData'. Use the MessageName property of the WebMethod custom attribute to specify unique message names for the methods.
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Jan 25, 2011
I am using PageMethods in asp.net. In code behind i have written a method which should call a javascript function for each loop & should come back & continue the loop.Is it possible?
[WebMethod]
public static void GetStatus()
{
for (int i = 0; i < 10; i++)
{
System.Threading.Thread.Sleep(500);
//Call javascript function
}
}
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Apr 24, 2010
I have a cascading dropdown (3 of them) Type, Categories and Sub Categories. Type loads first and upon selection of Type, Category load and selection of Category, Sub Category loads. Also i have 2 buttons, "Add Category" and "Add Sub Category" Upon clicking on these buttons, i call a JQuery Modal Form to add them. I use Webmethod in code behind to add them to database
This works perfectly in ASPX page.
Since I need use this in 3-4 pages, i thought of making the above as User control (ASCX). When i try to use this in a webpage, the webmethods in ASCX don't get called.
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Jan 11, 2010
I couldn't think of a decent title, so let me first apologize for that. I have a WebService (call it A) written for my app so I can take advantage of ASP.NET 3.5 AJAX features. I use the generated JavaScript proxy to make AJAX calls.As a side effect, WebService A is exposed for anyone to add as a reference to another project, which is great, except I don't want certain WebMethods to be available to external applications (in the same domain, BTW).So I've got two questions:Is there a way to control the exposure of WebMethods in WebService A?
If there isn't, I'm thinking I'll just add a separate WebService (B) that exposes the WebMethods I need from WebService A. But then,How can I prevent other applications from referencing WebService A while still allowing the application it originates in to access it?If that's not possible, I'm not really worried about it. The apps are all intranet-only, I just don't want the WebServices to be abused.Also, there is a similar question here already without any good anwers. The asker describes almost the same situation I'm in: [URL]
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Apr 6, 2010
I'm generating a file on the server which takes some time. For this, I have a hidden iframe which I then set the .src attribute to an aspx file i.e iframe.src = "/downloadFile.aspx"While this is taking place, I'd like to have a call to a web service return the progress. To do this, I thought I could use window.setInterval or window.setTimeout but Javascript seems to be blocked as soon as I set the iframe src attribute.Does anyone know how to get around this or perhaps try a different approach?I have also tried handlers, but the request never gets to the server so I'm assuming is a browser/javascript issue.
//Function that gets the file
function GetFile() {
setTimeout(GetProgress, 1000);
var iframe = document.createElement("iframe");
[code]...
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Jun 22, 2010
I have what should be a relatively simple task that's frankly got me stumped. I've researched it until my brain is fried, and now I'm puntingHere's the scenario:I have an ASPX page (Q2.aspx) that is decorated with the WebService,WebServiceBinding, and ScriptService attributes. That page contains a method, GetAllContacts, that is decorated with the WebMethodattribute and returns a string containing JSON data. (For what it's worth, the pageitself contains no other controls or functionality.)I have an HTML page that contains JavaScript which uses the XmlHttpRequestobject to invoke the GetAllContacts WebMethod on the ASPX page and transformthe JSON data into an HTML table. I have verified that my Web.Config file contains the appropriate protocol handlersfor HttpGet and HttpPut in the WebServices section under System.Web.webServices.
I have verified that my Web.Config file contains the ScriptModule entry under theSystem.webServer.modules section, and that it matches the appropriate documentation.
However, when I view the HTML page in a browser, the following occur:The web request goes through, but the results are for the unprocessed HTML from the ASPX page.The GetAllContacts method is never invoked, as evidenced by setting a breakpoint in its code.The code to invoke the Web service, however, is invoked, and the JavaScript callbackfunction that is invoked upon request completion is properly invoked.
It appears that the JavaScript code is largely set up correctly, but for some reason that is completely escaping me at this point, the HTML page will simply not execute the WebMethod on the ASPX page, and simply returns the page as though it were a plain HTML GET request. Clearly, an HTML document can't be evaluated by JavaScript's eval function, which brings me to my problem. (Also note that the JSON data appears nowhere in the HTML that's returned.)I am, frankly, baffled. I've looked at dozens of Microsoft articles, StackOverflow posts, CodeProject articles, and who knows what else. My code looks like it's okay. But I know better. I'm missing something simple, stupid, and obvious. I just need someone to point it out to me.Below you'll find the ASPX page code and the HTML code, in the hope that they'll shed some light.ASPX Code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Q2.aspx.cs" Inherits="Satuit.Q2" enablesessionstate="False" %>
<html>
<body>
[code]...
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Mar 16, 2011
The default behavior of a [WebMethod] attributed static method on an aspx page is to return the error to the caller. We are accessing these methods using json, and the only way we have found of capturing exceptions is either a try/catch in every webmethod on the site or using a javascript callback with the error (which has the unacceptable downside of exposing the error to the client).
Is there any way to globally handle these exceptions using the HealthMonitoring setup in ASP.NET?
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Dec 19, 2011
I have some code that is throwing unhandled DivideByZero exceptions in a WebMethod. These exceptions are not being caught by the global logging in Application_Error in global.asax. why exceptions thrown from a WebMethod are not handled by Application_Error?
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Sep 9, 2010
My scenario is i have 4 tabs, under every tab there are five cascadded combo. So for page load itself it calling webservice at last and populate all parent cascaded dropdowns in all the four tabs.
now I have made changes but still now its not working. By defeault [ScriptMethod(UseHttpGet = false)], so i made it [ScriptMethod(UseHttpGet = true)]. now on tab change i added that function and it is calling the web methods when changing the tab. But after the loading its again call the webservice and this time as the get is true so its not getting any value. And in the dropdown its showing "error 12030".
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Feb 17, 2010
I'm verifying e-mail address using WebMethods, however, I'm getting a 404 not found (error console) saying that it can't find activities.aspx.aspx. I am using URL-Rewriting, but I tried adding a detect for 'activities.aspx.aspx' and redirect back to .activities.aspx' but it didn't do anything.
Here is the error:
[code]....
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Aug 13, 2010
I have a table that stores songs and plays counter.
Here's the code:
//Increse plays counter
string ip = Request.UserHostAddress;
if (!string.IsNullOrEmpty(ip))
{
if (Cache["plays:" + trackID + ":" + ip] == null)
{
tracks.IncreasePlaysCounter(trackID);
Cache["plays:" + trackID + ":" + ip] = true;
}
}
I wonder what would be a better practice, store many cache items(like this) or store one item like a ArrayList that would contain the users who already heard that song. Is there any difference?
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Jun 14, 2010
Is the classic way of using include files still the best practice in ASP.NET. IS there a better way in ASP.NET to simulate include files? IF not can someone please provide an example of the .NET way?
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Sep 16, 2010
I am a beginner of C# programming. I have read a few books about C#.net. But I cannot find some exercises in the books. Someone told me to build up a blog to practice my coding.
But it is a huge task for a beginner. I just want some tasks to have a step by step learning process.
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Oct 20, 2010
I just noticed that I can save a lot of spacing by not using "as" when declaring variables, in some cases (not sure if this is something new in VS2010). For example:
Dim Name as string = "Bob"
works the same as:
Dim Name = "Bob"
I prefer the latter as some of my type declarations can be very long due to the library I am working with, and omitting the types simplifies the lines and makes them more readable. I am wondering a few things:
1. Do the two methods function at all differently?
2. Is this a bad practice, or generally excepted?
3. Is there a name for this?
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Apr 27, 2010
1) All users can browse open web site content.
2) To access memebrs area users must login.
3) Users can create , edit/update, delete there profile/information only.
4) Users can see / view other users profiles.
5) Admin can browse, create, edit/update, delete an any profiles.
I found many different ways to implement it, but what the best practice. May be you can point me in right direction.
Application Web based, MsSQL 2005, .NET 3.5, Server 2003.
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Feb 19, 2011
vs2010 (express)
.net 4.0
SQL 2008 (express)
MVC 3
C#
Entity Framework
I'm curious as to whether there is a well known way to add a column to a SQL table as a global change in MVC 3.
"Global change" referring to adding a column from database to UI... can someone please outline the fundamental steps.
(i.e., 1. add column in SQL table. 2. update .edmx (replace relative tables) 3. ...)
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Oct 7, 2010
I just want to know the declaration of variables in a separate class file or declaring in the same aspx.cs file. the best practice of declaring the variables.
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