C# - Complete The Post Back After Writing Out A File To The Response?
Jan 28, 2011
I have a button that when clicked, will generate a PDF and write it out to the response.This is the basic structure of the code:
try
{
using(Stream stream = generatePdf())
{
[code]...
Downloading the file works fine, except that it doesn't complete the postback.If I were to throw an exception above file.Transmit, the error handling would work properly and I would see the message get displayed in my browser. However, if there is an exception after the file.Transmit then nothing happens. The user saves/opens the pdf and the page does not reload.How can I make it so that the postback always completes, that way I can display an appropriate message to the user?
View 2 Replies
Similar Messages:
Feb 25, 2010
What I have?I have a ASP.NET page which allows the user to download file a on a button click. User can select the file he wants from a list of available files (RadioButtonList) and clicks on download button to download it. (I should not provide link for each file that can be downloaded - this is the requirement).What I want?I want the user to download multiple files one by one by selecting the required radio button and clicking on the button.What problem am I facing?I can download the file for the first time properly. But, after downloading, if I select some other file and click on the button to download it, click event of the button does not post back and the second file will not be downloaded.I use the follwoing code on the button click event:
protected void btnDownload_Click(object sender, EventArgs e)
{
string viewXml = exporter.Export();
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=views.cov");
Response.AddHeader("Content-Length", viewXml.Length.ToString());
Response.ContentType = "text/plain";
Response.Write(viewXml);
Response.End();
}
View 3 Replies
Nov 30, 2010
I have four textbox and a button in my page. After filling the textbox. When the user click save button. A loading image should be displayed. User should not feel that the page is postback to the server,Some thing like in facebook loading image.
View 5 Replies
Jul 14, 2010
Being new to ASP.NET I have run into trouble building my own Whack-a-mole program. I think my problem comes from using Buttons, which by themselves send post backs to the server, making the software unusable. The looks are in place, making new buttons show up in the grid, in different places by random. However, when a button is pushed - the score doesn't change (which I feel is strange).
Not so strange is that the Button doesn't work since it sends post back to the server - reloading the UpdatePanel. I think I should use a different controller like the CheckBox and style it hard using CSS (which isn't a problem). Is this the correct way to go, or should I make use of JavaScript AJAX instead?
Note to self: This technique shouldn't be used in a public application since it put too much unwanted pressure on the web server.
[code]...
View 1 Replies
Oct 5, 2010
I'm using a asp file upload control, however, when other controls trigger some post back actions, the file upload value return to null...any sample code i can follow please?
View 2 Replies
Mar 11, 2010
I have an ASP.NET Webform and inside the form I have an input type of file. What I would like to happen is for the form to post immediately after the user chooses a file.I have a server side function I would like to be called, let's say UploadedFile()What is the easiest way to accomplish this?
View 1 Replies
Feb 24, 2011
ones i select file i want to process that file directly not need to click another button to process
View 2 Replies
Jan 24, 2011
I am using file upload control and the captcha.After fulfill the form and upload the file , if user enter the wrong captcha test and click on button the uploded file being disaaper .I know this is the shortcoming of file upload control but client required thatIt needs to not clear the photo Plz help me out so that i can maintain the uploaded file state and have to capable so that user does not need to uploaded file again.
View 4 Replies
Jan 5, 2011
I am using Asp.net and requirement specifies i use html input to post files to server rather than asp:fileupload.[ Reason : Add more html input file controls similar to CPanel file manager.(i.e) clicking on link adds another file input from which user can select another file*.But when ever i post back Request Files collection is always empty.*
HTML FORM:
<form method="post" enctype="multipart/form-data" action="documents.aspx">
<div>
<input type="file" name="attachment" id="attachment" onchange="validate(this)" />
<span class="none">Filename should be within (1-25) letters long. Can Contain only letters
& numbers</span>
<div id="moreUploads">
</div>
<div id="moreUploadsLink" style="display: none;">
<a href="javascript:addFileInput();">Attach another File</a></div>
<input type="submit" id="btnSubmit" />
</div>
</form>
Javascript:
var upload_number = 2;function addFileInput() {
try {
var fileUpload = document.getElementById("attachment");
var elemSpan = nextElement(fileUpload).cloneNode(true);
var elemDiv = document.getElementById("moreUploads");
var d = document.createElement("div");
var file = document.createElement("input");
file.setAttribute("type", "file");
file.setAttribute("id", "attachment" + upload_number);
file.setAttribute("onchange", "validate(this)");
d.appendChild(file);
d.appendChild(elemSpan);
elemDiv.appendChild(d);
upload_number++;
} catch (err) { alert(err);}}
the validate(this) is a function that validates file types on client.When validation succeeds then the link to add more file inputs is enabled. Could someone throw somelight on this.
View 1 Replies
Jul 15, 2010
I searched google and found asynchronise post back trigger is used if we want update panel to post back on some event of control if it is out side the update panel. Than what is purpose of post back trigger ?
View 2 Replies
Feb 22, 2011
Using Vb.Net 2003 Asp.Net 1.1
I have a dynamic data bound drop down list, when the user selects thier selected item I have to use the autopostback feature.
Problem is: when the page comes back it is at the top of the page not where i have the control.
I don't really need it to focus back on the dropdownlist but to scroll to it, I want to do it in the code behind.
Any "New" ways to do it, I mean new as in code from like 2010 instead of old code from the early days.
I really don't want to use Page.Register new Script...... code if I can avoid it.
What would be cool is a ScrollToControl() Function for my code behind that worked but didn't register script.
View 3 Replies
Feb 9, 2011
I have a very odd and disconcerning problem. Just recently a page where I have 1 textbox and a buttoon has ceased to work.
When I look at the post coming into the PageLoad, the pageType is "POST", but the Page.IsPostBack is false!! and the textbox (which had content) is empty.
I have stripped all AJAX script out, so I have a very vanilla page (in a master page) being served.
The pages is
[Code]....
[Code]....
The page is "POST", but isPostback is false[Code]....
[Code]....
View 1 Replies
Jun 17, 2010
I have an ASPX page that I am using to write JSON. It works great in Firefox and Chrome, but when I try and use it in IE 8 it gives me an "The XML page cannot be displayed" error instead of allowing jQuery to load the JSON being written by the response. Here is what my code looks like:
protected override void OnLoad(EventArgs e)
{
Response.Clear();
Response.ClearHeaders();
Response.ContentType = "application/json";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Write(string.Format("[ {{ "Foo": "{0}", "bar": "{1}" }} ]", "Foo Content", "Bar Content"));
Response.End();
}
View 3 Replies
Oct 6, 2010
I'm currently using an SqlDataSource in ASP.NET/C# to let users insert, delete and update entries in a table/gridview. Every event needs to be written to an audit table.
I have easily implemented inserting and deleting - when inserting, the main info audited is just the parameter values of the insert query (e.Command.Parameters[0].Value.ToString() etc), and deleting is pretty much the same (just getting the ID in the delete query).
But with updating, I need to log which fields were changed and also their old values. How would I do this? As an example, here is the code for the inserting:
[Code]....
View 2 Replies
Jan 18, 2011
I know that you can enable NTLM authentication in an ASP.Net app using:
<authentication mode="Windows" />
However - I need to handle Forms, HTTP and other custom authentications in the same app, so ASP.Net's limited built-in support is no use.
The NTLM handshake should be fairly simple:
Request - [unauthenticated - no user info passed]
Response - 401 Unauthorized
WWW-Authenticate: NTLM
Request - Authorization: NTLM <base64-encoded type-1-message>
[code]...
I need to parse type-1 and type-3 messages and generate a type-2 message.
The structure for those messages is well documented but fairly complex - it seems very messy to write my own message generators and parsers. I think the methods to read and write these messages should already be in .Net, but I haven't been able to find them.
View 1 Replies
Aug 24, 2010
I have a web page (Provider) that creates an XML file to be send to the Requester in this fashion:
1. A Requester page needs to send an XML file to the provider page
2. Provider will read the XML file to authenticate the request
3. Provider will Create an xml file with some data.
4. Provider will send the xml file back to the Requester.
Can anyone provide sample code for both the Requestor page (step 1) and the Provider page (steps 2 & 3)
View 1 Replies
May 7, 2010
I have to large files in a database which users can download. The user clicks a link and the following code runs:
[Code]....
View 1 Replies
Mar 26, 2010
Sys.Webforms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near ' i have kept button in updatepanel and i am getting this error
View 2 Replies
Sep 21, 2010
I've created 2 web user controls. A = User control that displays an image, and B is the user control that hosts A. I'm trying to stream an array of bytes to A, but it seems like the Response.BinaryWrite method completely overwrites any heirachial controls (I can't see any of B's other controls besides the image).
How do I get A to just display the image from the byte stream? It doesn't come from a database, it's an image I created on the fly.
A's code:
[Code]....
View 6 Replies
Mar 7, 2010
Can v create a Write New Post like editor (in which im writing) with ASP.NET controls n without using Java Script that do the following tasks:
Bold, Italic, Underline, Image insertion etc.
View 2 Replies
Mar 23, 2011
What wrong with this code?
[Code]....
I would like the numeric values of the enum of Response.StatisCode
View 1 Replies
Dec 23, 2010
Spent ages trying to get this right but am struggling now. I have a list box and textbox, I can happily enter Email addresses into the textbox which are saved into a text file and populated in a list box. I want to be able to select a list item and delete it, along with it's record in my text file. I was going to do it by on the delete list item / button click, it delete's the text file and then writes and a new one with the remaining list items in the list box. Unfortunately it's re-writing the file but either not including the remaining list items. Here's some examples of what I've changed and what populates the text file:
StreamWriter1.WriteLine(Addresses.Items); - System.Web.UI.WebControls.ListItemCollection
StreamWriter1.WriteLine(Addresses.Text); - A blank line?!?
The code is below. The reason I wouldn't allow the user to delete the first list item is because I thought the code was working ok but for some reason putting in a blank line to start with, and if I deleted the line it'd delete all file content. No, I don't know why I thought that either.
[Code]....
where I've gone wrong? I've not actually slept since I woke up at 8am yesterday. It's now 11am... today.
View 5 Replies
Apr 3, 2011
I have a textbox that is used for searching. upon clicking the ok button and posting back, the function is called, and gets matching results by using sql query in the aspx.cs file this information will be displayed in the div tag and set visible. initially div tag will not be visible. after the button posts back, then the div tag will be set visible.
View 1 Replies
Jul 6, 2010
I have a user registration form. Here I have link to another page (card info page) which has to be filled for the registration. User fills the few fields in the user registration form and click on the link that takes to card info page. When user clicks the link in card info page to navigate back to registration page, the previous details entered in registration got vanished. So I need to redirect from card info page to registration page without postback. How can i accomplish that?Response.Redirect() is used for redirection.
View 6 Replies
Nov 20, 2010
i have tow dropdownlists in formview when i select from the first dropdownlist i take the value and postback to the same page with this line response.redirect("addtabs.aspx?SECID="+dropdownlist1.selected value.tostring())and thi second dropdownlist take th SECID and fill it self with sqldatasource with this parameter every thing okbut when post back the first dropdownlist doesn't select my choise but select the first item in it how can i make it still select my selection.
View 1 Replies