C# - How To Specify Form Parameter When Using Webclient To Upload File

Nov 21, 2010

As title, how to specify additional form parameters when uploading file using webclient?

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C# - Webclient Upload File Methods?

Nov 21, 2010

It seems that webclient supports PUT and POST uploading. Is there any difference?

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Jan 15, 2010

I need upload a file from a website to another website using WebClient or HttpWebRequest.

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Apr 1, 2011

I have an aspx website and I'd like to upload a file to it. The file is being processed later, so I need to support some extra information with it.

This is the website I have to far:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Upload.aspx.cs" Inherits="ABC.Web.Upload" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<form id="Form1" method="post" enctype="multipart/form-data" runat="server">
<input type="file" id="File1" name="File1" runat="server" />
<input type="text" id="FileId" name="FileId" runat="server" />
<input type="submit" id="Submit1" value="Upload" runat="server" />

This (and the code behind) works very well when using a browser and clicking through the form. But I want to upload the file using the WebClient from C# code. I don't have to use the WebClient. I can also modify the upload.aspx to suit me, there is no requirement that it works from a browser, but this is the only example I've got working.

Looking at fiddler (I just started using it, so I probably have missed it) I could not figure out how I would create such a request from code.

At the moment when using the WebClient I am specifying the address and the local filename. I have a breakpoint in the code behind in my website but the File1 and FileId are not set (as expected).

How do I have to modify the website and how do I have to use the WebClient to get the upload working?

EDIT: Just found out about the Request.Files, that will give me the file, but how about the other fields?

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Forms Data Controls :: Setting The ID Parameter To Form Parameter Source And Have Entered The Grid Views Name In The Form Field

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How do you use the http POST method with a Grid View on another page. I am trying to use the POST method to send the ID from the selected row of a Grid View, I am using a link button set to fire the select command and it has the Post Back URL set, from one page and then retrieve the ID value on another page using an Object Data Source. Also, under the Defining Parameters, I am setting the ID parameter to Form Parameter Source and have entered the Grid Views name in the Form Field.

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Web Forms :: Use Parameter Output Scope Identity To Named Upload File

Apr 3, 2012

I've sp :

ALTER PROCEDURE dbo.FileUpload (
@Filename nvarchar(250),
@FilePath nvarchar(250),
@IDPersonne BigInt,
@FileId int OUTPUT

[Code] ....

Everything works fine like this but i would like use the parameter output to do this when i want named the upload file like this :

 cmd.Parameters.AddWithValue("@FileName", Request.QueryString["IDP"] + p + "_" + filename);
cmd.Parameters.AddWithValue("@FilePath", "Files/" + Request.QueryString["IDP"]
+ p + "_" + filename);

How to do this ?

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Sep 28, 2010

How does file upload work on a web farm? does the file you upload replicate on all the servers ?

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VS 2008 - Creating A Form That Upload A File

Apr 10, 2010

I'm not sure where this should go (I don't know whether it's a database problem, or a code problem), but I think it's a code problem, so I'm posting here.

I'm working with a database that is storing images (actually, it's a modified version of the AdventureWorks database from Microsoft), and I'm creating a form that will let you upload a file. I've got a business object based on the table that I'm using (Production.ProductPhoto) and I'm using two stored procedures to either get (Production.ProductPhoto_Get) or add (Production.ProductPhoto_Add) an entry from/to the table. The image is being stored as a varbinary field in the database, and a Byte() in my business object.

The problem I'm having is that when I'm adding a new entry and uploading a file, the length of the file uploaded is correct (so I assume everything is going smoothly), and it gets passed along to my ProductPhotoProvider DAL class where I create a DbCommand and add the parameters for my stored procedure. The information is all added to the database successfully, and I'm returned the identity of the new entry as expected -- however, when I try to read this image back, it seems that the length is 1. I've put in break points and stepped through everything, and I don't know what's going on.

I think that I know my ProductPhotoProvider class is at least reading things correctly -- I can display other images from the database (that came with the database, that is) just fine. Mine just all come back with a length of 1.

I'm just hoping someone knows what the hell I'm talking about; I have a lot of programming experience, but this is my first major venture into ASP.NET. I have no idea which parts of my code are relevant, so I'll just post my Add and Lookup functions for now?!


My ProductPhotoProvider class is based off of an abstract class called AbstractDALProvider (which I can also provide if needed). I can provide the rest of my project, if needed, too.

Oh, and for good measure: I was told that when you used to store images in Microsoft Access, there was some sort of problem when retrieving the data and you'd have to strip the first 72 bytes of data from it, or something. I can only assume that this is not a problem here, because I have no problem displaying other photos that were not created by me.

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Dec 20, 2010

Using .Net framework 4.0I have a .net search application that reads values from regular html webforms submitted via the Post method. So the code to process these forms uses Request.form and looks like


I am writing a new .net application that needs to call this same search application.

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Mar 1, 2010

I'm mix up between webclient.OpenReadAsync and webclient.DownloadStringAsync? Can anyone explain clearly for me ? What are the difference between them? In addition, may i know whether webclient.OpenReadAsync got download the file or just open and read the file only without download to other places?

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i am using jquery form plugin for file upload . i am not able to get file in the controller . what could be wrong.

public string CreateOrganizationMeta()
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Submit A Form With A Large File Upload And Send Ajax Requests?

Mar 8, 2011

This works in other browsers but not in chrome. I am trying to allow users to upload large files and have an ajax call to update them on the progress of the file upload.

So a unique ID is generated on the client side and added to the action of the form before sending. Then the form is submitted (form only contains a file upload input) and an ajax call is made to get the progress of the upload. The ajax call goes to another page and uses the ID to lookup the upload.

I am using JQuery 1.5.1. Debugging this and putting something on the error function give me nothing other than "error". Not very helpful. I used Chrome's debugger and it just says failed to load resource xxxx.aspx. xxx.aspx is the URL i needed. Turns out that there seems to be some sort of conflict between the form and the ajax call.

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AJAX :: Async File Upload Control - Check File Contenttype Before File Upload Starts?

Jan 13, 2010

I am using the async file upload control to upload to a image file. I want the user to upload only jpg files. And for that I am checking the uploadedfile content type in server side, after the upload complets. I wanna check this, before upload starts. There is one javascript method

function startUpload(sender, args){}

but how to access the content type of the file selected by user.

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Web Forms :: SqlDataSource Control Parameter Property Name For File Upload Control

Mar 27, 2010

I'm using SqlDataSource to update image stored in the database. Everything is working fine using the code below but I don't know how to access the Property Name to get the content type of the image. How can I have the pass the File upload's content type to the parameter @imgType?


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Nov 8, 2010

I am downloading a file from remote server by using the following code.


If we paste the remote url in browser then it is downloadding the file without any error/warning.

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My question is similar to http://stackoverflow.com/questions/194579/how-to-detect-when-a-user-has-successfully-finished-downloading-a-file-in-php but I have to do the same using IIS, ASP.NET and C#.

None of the methods in the HttpResponse class provide feedback if the data was sent or not, TransmitFile just does its job (or not) and does not provide any means of knowing the result.I was thinking of using the .Filter property but then again, the filter is based on the HttpResponseStream which does also not provide any feedback.

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I am downloading a file from a remote location to my local machine. The paths I am using are saved in web.config and are in following format:

<add key="FileFolder" value="Files/"/>
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the code I am using to download is:

WebClient webClient = new WebClient(); [code]...

When i deploy it on the server; and run my program, i get a message saying that download has completed successfully. But the problem is that the file is downloaded on the server machine in the filefolder (LocalFileFolder). I want it to be downloaded on the local machine. What is it that I am doing wrong?

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I'm trying to use a java servlet in a 3rd party tool's web interface (CA service desk) to invoke it's download file functionality using a webclient in vb.net. The trouble is the text stream from response is markup and not the acutual text file stream.

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Is there a way I can process this redirected page in order to get at the download using a system.net.webclient?

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Mar 30, 2010

Referencing my Earlier Question, regarding downloading a file from a server and handling exceptions properly. I am positive that I had this solved, then in classic programming fashion, returned days later to frustratingly find it broken

Updated code:

private static void GoGetIt(HttpContext context)
var directoryInfoOfWhereTheDirectoryFullOfFilesShouldBe = new FileInfo(......); [code]....

This was working fine, and returning the zip, otherwise if the file didn't exist returning 404. Then on the client side I could handle this:

public bool Download()
using (var client = new WebClient()) [code]....

But the problem now is two things.

1) I get System.Threading.ThreadAbortException: Thread was being aborted in the server side try-catch block. Usually this was just a file not found exception. I have no idea what or why that new exception is throwing?

2) Now that a different exception is throwing on the server side instead of the file not found, it would seem I can't use this set up for the application, because back on client side, any exception is assumed to be filenotfound.]

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I want to upload files to the web servers from the client machines.

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Will the file be stored in a temporary location before copying to the final destination? Where will be the file stored in this case of uploading it from share folder?

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I am using webclient object to download a file to a windows folder from a sharepoint document library. The credentials I am passing to the webclient object are that of site collection administrator. everything works fine while i test it by uploading a file to the document library. But since the document library is email enabled; when an email is received the file is not transferred to the windows folder. i have put some workflow history events to see which user account is used when the email is received. the user account shown is the network service account. I have given write permissions on the folder to all the users; Everyone, Network service, the site collection administrator user etc. but still i cant figure out what is the problem.

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I am using the File Uploader to upload files. It is working fine. But I receive the page can not be displayed when I try to upload a file>4Mb in size.

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