Architecture :: How To Handle An Excel Stream And The Http Response

Jan 27, 2011

I'm using .net 3.5 and am currently creating a web application used to generate a report through Aspose.CellsActually, the page is composed in a form where I get the configuration of the report I have to generate. The "generation" button is in an update panel. When I click on it, the "generation" button is hidden and a progress bar appears. When the excel file is generated, I save it in a memory stream and I send it back to the aspx page where I change the headers to allow the file's download.

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I am generating an Excel file upon a click of a button in an update panel. It is throwing a parsing error.

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Response.ContentType = "application/"
String.Format("attachment;filename={0}", filename))
Private Function WriteToStream() As MemoryStream
'Write the stream data of workbook to the root directory
Dim file As MemoryStream = New MemoryStream
Return file
End Function

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C# - Convert Response Stream To An Image?

Aug 29, 2010

in previously asked question answeres said they dont get what i want to do exactly so heres is the full code also i simply want that instead of a TABLESe i rendered an image( of the content ) on the page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.IO;
using System.Text;
using System.Data;
using System.Drawing;
public partial class _Default : System.Web.UI.Page
protected void Page_Load(object sender, EventArgs e)
System.Web.UI.WebControls.Panel panelmain = new System.Web.UI.WebControls.Panel();
System.Web.UI.WebControls.Literal abc = new System.Web.UI.WebControls.Literal();
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DataSet ds = new DataSet();
DataTable dt;
DataRow dr;
DataColumn idCoulumn;
DataColumn nameCoulumn;
dt = new DataTable();
idCoulumn = new DataColumn("ID", Type.GetType("System.Int32"));
nameCoulumn = new DataColumn("Name", Type.GetType("System.String"));
dr = dt.NewRow();
dr["ID"] = 1;
dr["Name"] = "Name1";
dr = dt.NewRow();
dr["ID"] = 2;.............

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C# - Render Response Stream With Jquery?

Jan 9, 2010

MemoryStream export = new MemoryStream();
iCalendarSerializer serializer = new iCalendarSerializer(iCal);
return export;

so I am using the C# DDay.iCal library for exporting my calendars. Serialize takes in a "stream" so I passed it a memory stream. I now have a generic handler that calls the method that contains the above code.

public class CalendarHandler : IHttpHandler
private Calendar service;
private Membership membershipS;
public void ProcessRequest(HttpContext context)
service = new Calendar ();
membershipS = new Membership (null);
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public bool IsReusable
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So now I wrote the icalendar to the Outputstream. Now I have a jquery post that goes to this method and now I am not sure how to take the OutputStream result that the jquery post will get and make it popup with a save dialog box.

$.post('../Models/CalendarHandler.ashx', null, function(r)
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We're getting this weird exception when trying to create a BitmapDecoder off an ASP.Net response stream. This is the line of code that throws the exception:

BitmapDecoder dec = BitmapDecoder.Create(

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This is the exception stack trace:

System.IO.IOException: Cannot read from the stream. --->
System.Runtime.InteropServices.COMException (0x88982F72):
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how we can prevent this from happening?

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Update Image Based On Response Stream?

Sep 20, 2010

Is is possible to update an image on an HTML page using the response stream of an ASP.NET Generic Handler? For example, if I have the following code on a handler: [URL]

public void ProcessRequest (HttpContext context) {
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How can I call the handler in jQuery, using .ajax, and set an image on the page equal to the image that is returned by the Handler? I am ignoring the query string variable at the moment as I just want to get this working. Secondly, if I can do above, how can I loop through all of DIVs on the page that are of class "content", select a guid out of a hidden field to use as my query string parameter, and update the associated image within the same content DIV tag? A content div tag would look as follows:

<div class="content">
<asp:TextBox runat="server" Id="HiddenField_1" Value="C142E68F-B118-4565-9A9E-B2347F0B6D5B"/>
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<div class="content">
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<img src="#"/>

I would like to have all the images updated on a periodic interval, so essentially, as a quick recap, I would need to have: A loop through all of my DIVs of class "content", occuring every n. seconds. Extractation the GUID from the hidden field. A call to my ASHX handler to get the updated image. Set the returned image to the corrisponding image on the page. Is this something that would be difficult to achieve? If not, what would I need to do to make this function in the above manner?

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Is is possible to write to the http response stream from a dynamically created bitmap using the Response.Write/WriteFile without saving the image to the hard drive?

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HTTP - Stream.Write Fails On Server But Works On Dev Machine?

Jan 23, 2011

problem with Stream.Write() where it works under a dev (Windows 7) environment but fails under a server environment (Windows 2008 R2 Enterprise)?

I'm basically working with some third party code which reads from a FileStream and writing to an Http request, nothing unusual and it's doing the following things:

Ensuring that Response.KeepAlive is false (was originally true but worked W7 and not W2K8 so tried false but it doesn't );
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One other possibility I wondered about was whether the encoding might be different under Windows Server 2008 R2 as opposed to Windows 7?

Here's a code snippet from the relevant method (a bit convoluted but, disclaimer, I didn't write it :-):

string boundary = string.Concat("-------------------------", DateTime.Now.Ticks.ToString("x", CultureInfo.InvariantCulture));
byte[] boundaryBytes = System.Text.Encoding.UTF8.GetBytes(string.Concat("
--", boundary, "

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using (var fs3 = new FileStream(filePath2, FileMode.Open, FileAccess.Read))
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// If we've been passed an unhelpful initial length, just
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byte[] buffer = new byte[initialLength];
int read = 0;
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int nextByte = stream.ReadByte();
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HttpHandlers / Modules :: Write The Response Stream Content To A File On Disk

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I have an httpmodule and it has a handler for OnEndRequest. I am trying to write the HttpContext.Response.OutputStream to a file. I am trying to use the Read method of it. But when it is called the exception message i get is "Specified method is not supported". So i am not able to do what i want that is, write the response to a file on the disk. I am able to write the HttpContext.Request.InputStream to a file using its Read method which i do in a handler for OnBeginRequest.

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My web page contains a file upload control that is used to select excel file. What my code does; is to read the content of that file and store its content to DB. Right now, I save this file to server and read its content using OLEDB.I want to know is there any way i can read the content without saving it on the server?

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MVC :: Handle Dates In Mvc When Request Is A Http GET?

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I am using Response.flush() method for download the csv file. I am create the html on page and call the Response.flush method. It is working good But when i am cancel the download and do the another operation , It genrates the error.

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How To Handle 403.9 HTTP Errors In The Web.config File

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Do anyone of you know how to handle XXX.X IIS HTTP errors in a web.config file? I tried doing the following:

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But obviously that didn't worked, because the web.config file expects an integer as the statusCode value.
CONTEXT: WinServer 2003 - ASP.NET 3.5

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HttpHandlers / Modules :: Trying To Get A Handle On Http Handlers?

May 27, 2010

I have created a dynamic signature for our members in 2.0 with VB code behind that they can use as a signature in various message boards using an http handler.This is the first time I have evered used a http handler and I am probably missing a step on how to use it.The direct url to the signature is:
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I know all about this exception, read the msdn article here [URL] but I do not know how to handle this when my boss does not want me to throw in false for the Response.End.

Here's what I have:



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Architecture :: Handle Different Login Scenarios?

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I need to handle 2 different scenarios.1. Webapplication in a Servercenter. A user can authenticate against a companydatabase with an user account that is stored inside the companytable. We provide services to different companies, and every company has their own database. A management database contains the relation of company to database and server. A user need the companyname, username and password to logon.2. Webapplication on a company serverThe services are hosted on hardware inside the companynet. There is only one company to handle, so that a user doesn't need a companyname for login.Whats the best approach for this problem?

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C# - MP3 Download In An HTTP Response?

Jun 9, 2010

I've a question about something I'm searching for,for too long! We've build an application from which an admin upload songs into a database. Then user can bought songs and download it individualy. The problem is that when user download MP3 songs with the code below, it works great in Firefox and Chrome but not in IE8 simply because WMP trying to open the songs and it just don't get it instead of having a "Save as" dialog? Any issue on HOW can i force to have the "Save As" diaglog? Note that I have not MP3 physicaly on server it's in database. So I can't direct link to song ...

Here's my code :

// Remove "specials chars"
foreach (char aChar in @"/:*?""<>| ") {
if (aChar == ' ') {
songNameAndExt = songNameAndExt.Replace(' ', '_');
} else {
songNameAndExt = songNameAndExt.Replace(aChar.ToString(), string.Empty);
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.Headers.Add("Content-Disposition", string.Format("filename={0}", songNameAndExt));
HttpContext.Current.Response.OutputStream.Write(songData, 0, songLength);

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