Ajax - .net Generic Handler Encoding ?

Sep 6 10 at 18:22

I'm sending values to Generic Handler via Ajax like that way.

xmlHttpReq.open("GET", "AddMessage.ashx?" + (new Date().getTime()) +"&Message=" + Message,true);

when message contains they are looking like that on Handler in context.Request. these characters are looking as it should. But in context.Request.Url they are looking like and when i want QueryString values it gives me what can i do?


Asp.Net Routing To A Generic Handler?

Sep 20 10 at 20:55

I Have a generic handler that's serving member logo images:


Now, I want to use it by caling a url like:


So I would create a route for that (pattern: "logo/{username}.jpg"). But, my problem is - how do I retrieve {username} when inside ProcessRequest() of my generic handler? It's not a page, so I can't get Page.RouteData.Values.

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Handler And Generic Handler?

Mar 16 10 at 3:08

In Visual Studio 2010, when you say new Item, you can see Asp.NET Handler and Generic Handler. Can you tell me what's the difference, I think it came with .NET 4.0 because I couldn't find related thins on Google.

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Looking For A Generic Handler / Service For Mongodb?

May 25 10 at 2:43

I am new to MongoDB and have a perfect place in mind to use it. However, it's only worth it if I can make the queries from JavaScript and return JSON.

What's the easiest way I can implement a generic service/handler in asp.net/c# that would allow me to interact with mongodb via JavaScript? I understand JavaScript can't call mongodb directly, so the next best thing is what I'm looking for.

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Get Image By Database By Generic Handler?

Jul 09, 2009 11:31 AM

In my asp.net application, i want to display some data from database, every thing is fine but the image display.

i have used a generic handler "DisplayImg.ashx" file in grid view for imageurl

the code is


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C# - Dynamic Image (from Db) Using Generic Handler

Feb 9 10 at 17:57

I'm trying to using a Generic Handler to retrieve and display images that are stored in a database.

But its just not working. Ive tried verious of the code below, but I cant seem to get it to work.

<%@ WebHandler Language="C#" Class="IconsDb" %>
using System;
using System.Web;
using System.Linq;
using System.Data.Entity;


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Secure Generic Handler Calls?

Jul 9 10 at 10:30

I am creating a myspace application and for some database entries I am using generic handlers which I have hosted on another website. From my myspace application I use ajax calls to those handlers to perform the activities that I want. I want to know how can I make these ajax calls secure? I mean I want to be sure that the handlers are being called by only the myspace app and not by entering url into the browser etc.

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Web Forms :: Passing Parameter To Generic Handler

Aug 26, 2009 07:53 PM

I would like to pass a url string parameter into a generic hanler (.ashx). I have been googleing for days with no luck. Here is my handler.


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How To Get The Virtual Path Of A File From A Generic Handler

Mar 22 at 3:27

How can i resolve a virtual path to a file into a path, suitable for the browser, from within a generic .ashx handler?

e.g. i want to convert:




If i were a WebForm Page, i could call ResolveUrl:


which resolves to:


But i'm not a WebForm Page, i'm a generic handler. You know, that IHttpHandler object with all kinds of things injected:


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C# - Send Html Text To Generic Handler?

Mar 1 at 16:41

I have a WYSIWYG editor on one of my forms and I want to send the contents of the editor to an ASP.NET generic handler for processing via an Ajax call.

I am having a little bit of trouble parsing the html received.

Client Side:

$('.send').bind('click', function(event){
var message = $('#TxtMessage').htmlarea('toHtmlString');
message = escape(message);


So the problem is that even when I call Server.HtmlDecode(string) the message is garbled.

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Session Not Working In Generic Handler .ashx In Firefox?

Apr 28 10 at 13:29

I have created .ashx which implemented IRequiresSessionState, so I can create session variables in that ashx, it worked in IE, but doesn't work in Firefox.When access this session variable from other pages it's NULL.

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Serving An Image With A Generic Handler Within A List View. Is It Possible

Feb 27 at 7:43

Currently in my webpage i load images to the ListView object as follows...

<asp:ListView ID="ListView1" runat="server">


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Content Type When Serving A File In A Generic Handler?

Dec 10 10 at 5:15

I'm busy writing a handler to serve various documents for download or presentation in web forms pages. The documents range from various image formats, to PDF, to MS Office documents, to generic binaries. My basic draft of the download process is as below:


However, I have some misgivings about lumping all documents together as application/octet-stream, and I would prefer, if feasible, to use a more specific content type per document type. I have a DB table for document types where I could store this. Am I going in the right direction, and if so, where can I find a suitable starting list of content types for document types?

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C# - PlatformNotSupportedException When Saving A File From Silverlight Through A Generic Handler

Jul 30 10 at 20:51

I have a Silverlight application hosted in an ASP.NET site, through which I'm starting an HttpWebRequest to a Generic Handler in order to save a CSV file to the user's machine.

From the Silverlight app, a Uri is constructed with parameters to make the CSV file server-side. A button is clicked which triggers the following:

string httpHandlerName = "HttpDownloadHandler.ashx";
// CustomUri handles making it an absolute Uri wherever we move the handler.
string uploadUrl = new CustomUri(httpHandlerName).ToString();
UriBuilder httpHandlerUrlBuilder = new UriBuilder(uploadUrl);
httpHandlerUrlBuilder.Query = string.Format("{3}startdate={0}&enddate={1}&partnerId={2}", startDate, endDate, partnerId, string.IsNullOrEmpty(httpHandlerUrlBuilder.Query) ? "" : httpHandlerUrlBuilder.Query.Remove(0, 1) + "&");
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(httpHandlerUrlBuilder.Uri);
webRequest.Method = "POST";
webRequest.BeginGetResponse(new AsyncCallback(GetResponseCallback), webRequest);

Now here is the ProcessRequest code from the HttpDownloadHandler.ashx

public void ProcessRequest(HttpContext context)
_httpContext = context;
string partnerId = _httpContext.Request.QueryString["partnerId"];
string startDate = _httpContext.Request.QueryString["startDate"];
string endDate = _httpContext.Request.QueryString["endDate"];
ExportCsvReport exportCsv = new ExportCsvReport();
_csvReport = exportCsv.ExportMemberRegistrationReport(partnerId, startDate, endDate);
context.Response.AddHeader("content-disposition", "attachment; filename=Report.csv");
context.Response.ContentType = "text/csv";

Here is the HttpResponse header information that comes back when the Save File Dialogue refuses to appear:

Buffer: true
BufferOutput: true
Cache: {System.Web.HttpCachePolicy}
CacheControl: "private"
Charset: "utf-8"
ContentEncoding: {System.Text.UTF8Encoding}
ContentType: "text/csv"
Cookies: {System.Web.HttpCookieCollection}
Expires: 0
ExpiresAbsolute: {1/1/0001 12:00:00 AM}
Filter: {System.Web.HttpResponseStreamFilterSink}
HeaderEncoding: {System.Text.UTF8Encoding}
Headers: 'context.Response.Headers' threw an exception of type 'System.PlatformNotSupportedException'
IsClientConnected: true
IsRequestBeingRedirected: false
Output: {System.Web.HttpWriter}
OutputStream: {System.Web.HttpResponseStream}
RedirectLocation: null
Status: "200 OK"
StatusCode: 200
StatusDescription: "OK"
SubStatusCode: 'context.Response.SubStatusCode' threw an exception of type 'System.PlatformNotSupportedException'
SuppressContent: false
TrySkipIisCustomErrors: false

When I navigate to localhost/HttpDownloadHandler.ashx while the site is up, without initiating it from within the Silverlight app - the Save File Dialogue appears just fine, it seems to be a case where Silverlight is not accepting the response header properly.

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Configuration :: Web Setup Does Not Install Generic Handler (ashx)

Jul 21, 2010 03:05 PM

I've created a Web application (VS2008) that contains a single Generic Handler (handlername.ashx) and a web.config. I've also added a Web Setup project to use for deployment that uses the primary output from the Handler project. Install works without any errors and all the referenced DLLs are installed in the target location, with one issue. It doesn't install the ASHX file or the web.config.

Publishing the web app to the target location works as expected (includes both DLLs and the ASHX/Config files).

Is there something specific I need to do for the Web setup to include the ASHX/Config files?

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HttpHandlers / Modules :: Cannot Retrieve An Image Using A Generic Handler

Mar 26, 2010 08:02 AM

I wrote a generic handler like this:


and on the other page I would like to retrieve the database image using :

<img alt="" src="ShowImage.ashx?ID=467711" />

but I am getting nothing in this case. The picture exists and there are 91000 bytes in array.

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Web Forms :: Generic Handler Compilation Error VS 2005?

Feb 10, 2010 10:22 PM

I have write a simple generic handler with VB as the language.

I am then trying to access the static properties of the handler via an aspx page using <%= handlerclassname.propname %> code.

However it is failing to compile. The compiler throws an error Name HandlerClassname is not declared.

I have checked in my code about namespace or something like that, but there aren't any.

Compilation option in web.config is


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HttpHandlers / Modules :: Access Particular ASPX Page From Generic Handler

Dec 02, 2008 04:37 AM

I was wondering how to get access to a particular page class from Generic Handler (.ashx). My purpose is to access Default.aspx from the generic handler, create server controls dynamically and then add them to the controls collection. I have thus far been unable to do this. Can someone point me in the right direction? Basically, I have two requirements

i) How to access a certain page class from generic http handler? For example, how can i reference default.aspx and deault.aspx.vb from my ashx?
ii) How to add controls to any form from within the ashx file? I am not looking for the html32textwriter and response.write combinations? I wanted to output controls dynamically like we can in code behind pages like:

form1.controls.add(new hyperlink())

Now, in the above, how to get access to this FORM1? To put things into perspective, here is what I am trying to do:

I have an ashx file that would create controls dynamically based on the querystring parameter in Default.aspx. So, for example, the requested url is default.aspx?op=create. The ashx handler would read the op querystring and create controls for the create operation.

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HttpHandlers / Modules :: Redirect To Login Page From Generic Handler

Sep 08, 2010 05:00 PM

I have created a asp.net generic handler to use it in auto-complete text box. Here is my code to it

/// <summary>

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Web Forms :: Using Generic File Upload Handler For Uploading Files In C#?

Sep 21, 2009 03:05 PM

Am trying to call upload handler on button click to upload the files.some how i don't see that it is working:

class Uploader : IHttpHandler
public void ProcessRequest(HttpContext context)
string strResponse = "error";
string strFileName = context.Request.QueryString["fileName"];
string strFilePath= context.Request.QueryString["filePath"];
//string strExtension = Path.GetExtension(context.Request.Files[0].FileName).ToLower();
string strSaveLocation = context.Server.MapPath( strFilePath);
strResponse =
context.Response.ContentType =
public bool IsReusable
return false;


<asp:Button ID="btnUpload" runat="server" CssClass="button" Text="Upload" OnLoad="btnUpload_Load" />
protected void btnUpload_Load(object sender, EventArgs e)
string strFilePath=System.IO.Path.GetFullPath (FileUpLoad1.FileName);
(sender as Button).OnClientClick = "Uploader.ashx?fileName=" + FileUpLoad1.FileName + "&filePath=" + strFilePath;

Will that still cause postback when button is clicked?

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Flash - Can't Get Session In Generic Handler (.ashx) When Using Firefox Or Chrome Except IE

Nov 5 10 at 3:22

im now using FancyUpload (flash upload) to allow user to upload files in a small project. I use Generic Handler to handler in server when user uploads his file, but i'm getting error: Can't get session in Generic Handler (.ashx) when using Firefox or Chrome etc except IE I read so many solution and finally found out that Flash has some bug that can't send cookie in Firefox or Chrome except IE, Maybe i can check the session in Flash before it's start to send the file to the server or check session in Generic Handler before save it

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HttpHandlers / Modules :: Use Generic Handler To Call External Web Service?

Oct 28, 2010 11:21 AM

I am tring to call external web service through generic handler ,post some example code for the call webservice from generic handler .

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HttpHandlers / Modules :: Passing Parameters From Webpage To Generic Handler Page?

May 20, 2008 10:59 AM

Q.how to pass parameters from webpage to Generic Handler page and how to receive them

1. When the user clicks a button I want to pass 2 parameters to the 'ViewImage' page. The code below passes just 1 parameter (concatenates the variables sToolGUID and lGrid). Can I split the parameters up or do I have to split them up in the 'ViewImage' page?[Code]....

2. The code below in the 'ViewImage' generic handler page receives 2 parameters from the webpage (if I can send 2 parameters). But how would i use the string instead of the index (querystring["..."]). It looks like I can only use the string querystring["id"] to retrieve the parameter.


I get the impression I can only send 1 parameter then use the split function to seperate the querystring but surely there is a way to send 2 parameters and why do I have to use an index?

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State Management :: Setting Session Values In Generic Handler And Accessing Them From A Page?

Jun 10, 2010 12:31 PM

I have a generic handler in which I fill up a Session variable. I implemented the IRequiresSessionState interface, so it shouldn't be a problem.

In a given page, I want to display that value, but it seems like the value is always empty. Is it because the session that is accessed and written to in the handler isn't the same one that is used on this page?

In the handler, I used context.Session["EID"] = "somevalue";

edit: i found out what the issue is but I do not know how to solve it. It's because I have this Java applet which reads out an eID, calls the handler to store the data, but the session used by the applet is not the same as the session used by the browser... so how could I exchange this data in a safe way?

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HttpHandlers / Modules :: Capture The "HttpContext" Requests String From The Generic Handler?

Apr 29, 2009 02:13 AM

I want to capture the incoming requests string from users that hit my Generic Handler. A user data streaming the xml requests to this Generic Handler and I want to capture all information they send to my Generic Handler. How do I do it?

Here is the Process method in the Generic Handler and some codes that save the data from the requestor but it doesn't work

void Process(HttpContext ctx)
HttpRequest request = ctx.Request;
HttpResponse response = ctx.Response;
if (request.Files.Count > 0)request.SaveAs(@"C:com.log",

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Forms Data Controls :: Display Data Using Generic Web Handler?

Feb 04, 2011 04:03 AM

I want to bind gridview partially for e.g. show only 10-20 records first and next 10-20 records after scrolling on panel. For that purpose i want to fill gridview using generic handler in asp.net.

Actually i want to know how to return dataset or datatable or xml using generic handler in asp.net.

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HttpHandlers / Modules :: Generic Handler / Prevent Data From Being Written To Live Table Via The Live.aspx Page?

Jun 28, 2010 06:45 PM

I am using a generic handler (indicator.ashx) to create a graphic that is overlayed from information from a table (called LIVE) from our SQL database. This is working very well and I am very happy with the results.

However I am having an undesirable issue where the query string that is used for this is also being accessed by another page (called ReceiveLive.aspx) which is populating our LIVE table with data when we don't want this. I have been able to track this issue down to our generic handler that seems to populate this table with data whenever the handler is accessed.

The query string that is used to access our graphic through our generic handler is

Our other page that writes data to our LIVE database used the query string
http://mydomain.com/live.aspx?ID=ABC001 which is normally only accessed by a small piece of software that sits on the users PC and sends the data when necessary.

My question is this: How do I prevent data from being written to our LIVE table via the Live.aspx page everytime a query string is processed by my indicator.ashx is accessed?

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Webmailer Encoding Characters / Set The Content Encoding Of The Whole Page?

Jan 04, 2010 12:22 PM

I have written a web mailer that can send and receive emails and display them on a webpage.I have a problem displaying special characters though. Like Russian, and Greek and chinese.I am using openpop.net and I can get the encoding of the incoming email as one of my variables.Thing is, how do I display it? Do I set the content encoding of the whole page to what that specific email encoding is?I've got it UTF-8 at the moment and I get garbage.

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MVC :: Encoding Whitespace / Not Encoding The < As A Encode But Into The Form <?

Jan 05, 2010 10:30 AM

Im pulling out a text field from the database which has and 's in it for line breaks. Which I have left there for pupose of being able to edit the fields later on.

So when i try to display the text I need to replace them which I have done with:


Simple enough. Only when I run the page the source code I get for it is:

<br />

So it seems its not encoding the < as a encode but into the form <

Does anyone know how to stop this happen. Or a method around it?

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Ajax ToolKit HTML Editor Text Encoding?

Jul 19, 2010 06:36 PM

I'm using the lovely Html Editor control of AjaxToolkit packet and faced to the following problem:- when a French text is typed like this:"En dépit de la détection d'une possible nouvelle fuite, le responsable des opérations de lutte contre la marée noire a autorisé la compagnie BP poursuivre pendant 24 heures les tests qu'elle effectue sur le puits endommagé."in code behind from the Editor's property Content I retrieve the text like this:

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AJAX :: ScriptManager Fails On Encoding.UTF8.GetString?

Mar 07, 2011 03:12 PM

I'm having problems with a bit of code, where i'm trying and failing to read the EXIF data from jpg files. I cannot figure the error, although everything I've been able to find online points toward the same thing: my code is correct. The code is as follows.


The only error i get is a javascript error in IE8, stating Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.". I have absolutely no idea what it's doing, why it's going wrong or how it's failing.

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Custom Server Controls :: Using The Generic Type 'System.Collections.Generic.IEnumerable' Requires '1' Type Arguments

Nov 25, 2010 08:41 AM

I'm trying to create a control out of a class I found, and one of the overridden functions is the following:

protected override void PerformDataBinding(IEnumerable data)

However, when I try to build the control I'm getting the error as shown in the subject. I've tried searching, and it seems the signature for the original function matches the one I have, and all other solutions I've seen uses the same signature.

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Difference Between Generic And Non - Generic Collection?

Oct 30, 2010 02:44 AM

What is the difference between generic and non-generic collection?

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HttpHandlers / Modules :: HTTP Custom Handler / Define Such A Handler On The IIS6

Nov 16, 2009 01:15 PM

I have following custom handler (defined using the vs2008) which runs fine on the IIS7:

<add verb="*" path="Home/*" validate="false" type="MyHandler" />

which maps urls such as /Home/Dummy to /start.aspx?user=Dummy.

The problem is that our applications on the productive enviroment run on the IIS6.

How can i define such a handler on the IIS6 or how can I make it work?

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How To Call Static File Handler From HTTP Handler In IIS7 And 4.0

Jan 24 at 3:56

I create custom HTTP handler for auto generating file and I want to tell IIS7 to serve current request like normal static file because I need to use IIS and web.config file to control compression setting and any other HTTP header of current requested file.I know. there is an internal class called StaticFileHandler in ASP.net. But I cannot access it. Or you have any other way to work like this.

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How To Add A Javascript Event Handler Using Ajax

Feb 22 10 at 12:56

I am wondering how to add a javascript event handler using asp.net ajax. I need to add event handlers after ajax update because Jquery plugin to sort tables doesn't work and the onload method to display a screen keyboard does not trigger as well. Is there a way to do that? Maybe I need to switch to some other ajax library or/and try Asp.Net MVC to accomplish?

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AJAX :: Check If A Component Has A Handler?

Sep 24, 2010 10:55 AM

I'm trying to check if the component already has the event...In my example here, I would like to know if the CollapsiblePanel already has the expandComplete handler before I add the event


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AJAX :: How To Programmatically Trigger An Event Handler

Mar 02, 2010 05:58 PM

I need to run a SELECT box [on]change handler after changing the selectedIndex.

I see the selectBox._events['change'][0].handler() method added by $addHandler, but what is the ASP.NET Ajax way to raise it as an event?

The backup plan is to set sel.onchange directly and skip ASP.NET Ajax events completely.

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AJAX :: Handler Not Added - Getting Runtime Error

Aug 18, 2010 08:41 PM

I've inherited some code that is having a serious problem. On one page, there are several pairs of "Yes"/"No" checkboxes that act like pairs of radio buttons through the use of the ACT MutuallyExclusiveCheckBoxExtender control. They work as expected. However, when I navigate away from the page, I get a "Microsoft JScript runtime error: Sys.InvalidOperationException: Handler was not added through the Sys.UI.DomEvent.addHandler method." error in the dynamically-generated ScriptResource.ax...c2d9970 [dynamic] file.

The specific method in the dynamically-generated code is:
var $removeHandler = Sys.UI.DomEvent.removeHandler = function Sys$UI$DomEvent$removeHandler(element, eventName, handler)

The element is set to any of the checkbox controls (I've removed them one-by-one and it happens to ALLof them) and the eventName is "Click". I gather from the code that it's trying to do a removeHandler before the addHandler for the particular element has taken place. True, I don't have any explicit addHandler lines in my code, but I don't any explicit removeHandler lines either. About all I've got in the aspx code is:
[Code] ....

The formatting of the code in this message is a bit weird, but it's basically a simple table with three columns. On each row, there's text in the first column, the checkboxes in the second column and a button in the third. I've searched high and low on the web and nearly every thread I read about his error talks about it in relationship to the use of command buttons in an ACT UpdatePanel.

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Update Using Ajax When Displaying An Image In A Handler?

Dec 9 10 at 18:33

I have a complex page. Basically, it is a ListView with images displayed through handlers. Paging is done through a datapager. This is all wrapped in an Ajax UpdatePanel so it pages seamlessly.

When the user sees a image they like and click on it, it should display in an image above the ListView. This work when I DON'T use the updatePanel, but of course, then I get flicker. Wrapping it in an update panel results in the paging working. When the user clicks an image it goes to the db as expected, but it simply never updates the image being displayed.

Here is how the image that is clicked on is defined.

<asp:ImageButton ID="imgbtnImage" runat="server" ImageUrl='<%#"~HandlersThumbnailDBHandler.ashx?id=" & Eval("ID")%>' CommandArgument='<%#Eval("ID")%>'/>

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