Downloading working fine but not getting opened in the required page !

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Hi,
I have made a functionality where user selects something to download and get it in a new tab easily with the file save open dialogue box. It is nice and acceptable but the cross browser issue prevails here. Because in Mozilla the new tab stays as long as the file is not fully downloaded but in chrome the page persists even if the download is complete. Sometime it takes time to download the file(.csv) so I created a page that has HTML mark up as please do not close this window but however it never gets properly done. I am getting a error : request eroor 404, file was not found something like that and thus it is preventing the things to happen correctly. Could you please suggest me something out of it ???
Here is my code :

C#

 Session["download_file_link"] = strResult;
                string strDownloadPageURL = strResult;
                ScriptManager.RegisterStartupScript(this, typeof(string), "OPEN_WINDOW", "window.open( 'Download.aspx', null, 'height=400,width=800,status=yes,toolbar=no,menubar=no,location=no' );", true);

/* than on download page */

public void Download_file_for_user(string strFilename)
    {
        System.Net.HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create("http://www.cybexexim.net/Downloads/" + strFilename);
        HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();<-- error here
        Response.Clear();
        Response.ClearHeaders();
        Response.ClearContent();
        Response.AppendHeader("Content-Disposition:", "attachment; filename=" + strFilename + "");
        Response.AppendHeader("Content-Length", objResponse.ContentLength.ToString());
        Response.ContentType = "application/download";
        Response.Close();
        Session.Remove("download_file_link");
        Response.End();
    }

calling this method on page load. It still doesnt allows to open this page properly and file doesnt gets download. However If I use my download string directky on javascript used above than no prob exists but download.aspx page
never comes. Please help !

Posted 6-Aug-12 19:43pm

Taresh Uppal

Updated 6-Aug-12 19:58pm

v3

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Santhosh Kumar Jayaraman · Accepted Answer · 2012-08-06T20:40:00

Solution 1

Try something like this.

C#

 System.Net.HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create("http://www.cybexexim.net/Downloads/" + strFilename);
request.ContentType = "application/json; charset=utf-8";
request.Credentials = CredentialCache.DefaultCredentials;
try
{
    response = (HttpWebResponse)request.GetResponse();

    // perform normal processing
}
catch(WebException ex)
{
    // are you sure you just want to swallow the exception like this?
    continue;
}

if it still throws error, catch the error and let us know the error message.

Posted 6-Aug-12 20:40pm

Santhosh Kumar Jayaraman

Updated 6-Aug-12 21:26pm

v2

Comments

Taresh Uppal 7-Aug-12 3:12am

hello, I really appreciate your help but this is not what I am looking for. I said that I am able to download files but still I want that the tab in which new page open for download should be designed and customized by me having something like "Please do not close this tab etc etc..." So that if server takes time to render the file on machine user don't close the tab. In order to achieve that I am using all this and not getting successful. I tried your code it said the URL is empty..:(

Taresh Uppal 7-Aug-12 3:13am

The java script to open into anew tab if I pass the download link of the file it works properly but open a blank page not a customized one and if I pass the required parameters to the Download.aspx page than i get these errors. Now I guess I am more specific...

Santhosh Kumar Jayaraman 7-Aug-12 3:13am

You have to make changes in the code.

WebRequest.Create(stringBuilder.ToString()) as HttpWebRequest;

Here you have to use your code.

Santhosh Kumar Jayaraman 7-Aug-12 3:14am

Yes. I have given the code to donwload files in new page, not through javascript.and i guess thats what you wanted

Taresh Uppal 7-Aug-12 3:25am

but it gives an exception that URL is empty in this line.

Taresh Uppal 7-Aug-12 3:26am

Isn;t there any way that download is received in my download.aspx page ???

Santhosh Kumar Jayaraman 7-Aug-12 3:27am

I have updated the solution .check now. I think you didnt use ur URL, thats y its null.

Taresh Uppal 7-Aug-12 3:27am

ok m trying this

Santhosh Kumar Jayaraman 7-Aug-12 3:28am

There is another way.
This is my document page code.

public partial class Document : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Employee emp= Session["emp"] as Employee ;
ShowDocument(document.FileName, document.FileContent);
}

private void ShowDocument(string fileName, byte[] fileContent)
{
string[] stringParts = fileName.Split(new char[] { '.' });
string strType = stringParts[1];
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
Response.ContentType = strType;
this.Response.BinaryWrite(fileContent);
this.Response.End();

}
}

Santhosh Kumar Jayaraman 7-Aug-12 3:30am

and in my previous page. on button click

Session["emp"] = employee;
Response.Redirect("~/Document.aspx");

Taresh Uppal 7-Aug-12 3:32am

to b very honest before posting the code I tried this and got this same error :
The remote server returned an error: (404) Not Found.

Santhosh Kumar Jayaraman 7-Aug-12 3:32am

Can you check the download path? I am not sure whether it is valid

Taresh Uppal 7-Aug-12 3:40am

I want that this download page should be open in a new tab as i have decided the hieght and width for it and lemme check the path and I will get back to you ..:)

Taresh Uppal 7-Aug-12 3:47am

I guess the download link is not valid...because now thanks to you atleast I am getting my page opened in that new tab however file is not getting download. The Url that we trying, the strfilename is correct but when I add it with cybexexim.net than issue appears becuse "Download/" is a page and after that we adding download link to it without aspx at the end as it is a csv. Moreover it makes the totla link somethn k like dis : http://cybexexim.net/Download/http://localhost:3549/ODMS/download/7-Aug-2012-13-12-12-AM-printers.csv which is surely invalid i guess.

Santhosh Kumar Jayaraman 7-Aug-12 3:48am

Yes that should be the issue

Taresh Uppal 7-Aug-12 3:56am

I tried your given code, In my case its a csv so how can i access to its contents, I mean you passed two parameters two your method one is file name and other is binary array..I am passing my file link that I wana get download and what shall i pass in file content ???

Santhosh Kumar Jayaraman 7-Aug-12 4:33am

You no need to pass file content. FileCOntent is byte array type. In my case i converted file to byte array and saved byte array to database. Here you have to make changes accordingly how you are saving files

Taresh Uppal 7-Aug-12 5:12am

I tried by just passing the source file download link and still that dialogue box is not coming.

Santhosh Kumar Jayaraman 7-Aug-12 5:15am

are you gettin some value in objresponse?

Taresh Uppal 7-Aug-12 5:23am

nope, it is null...

Santhosh Kumar Jayaraman 7-Aug-12 5:24am

You mean you are getting null in objResponse object in below line. Then defintely oBjRequest object is also null..
Check the path and file again. It's not reading the file.

System.Net.HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create("http://www.cybexexim.net/Downloads/" + strFilename);
HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();

Santhosh Kumar Jayaraman 7-Aug-12 5:25am

I dont have access to Your code, so you have to put breakpoints and debug where it is going wrong

Taresh Uppal 7-Aug-12 5:28am

and now even that customised page is not coming. The whole issue is with this objrequest and objresponse...

Taresh Uppal 7-Aug-12 5:33am

Is it necassary to pass this http://cybexexim.net/Download/ ?
cant i directly use my download link, ? I want a simple thing that unless download is complete I dnt want user to see a black page, All I want is to show a html marked page and download in that, simply. Dont know where I am going wrong ...:(

Santhosh Kumar Jayaraman 7-Aug-12 5:33am

You can directly pass your download link, i dont know where is your download link and all

Taresh Uppal 7-Aug-12 5:35am

http://localhost:3549/ODMS/download/7-Aug-2012-13-12-12-AM-printers.csv is my download link which is saved in strFilename.

Santhosh Kumar Jayaraman 7-Aug-12 5:38am

then try this.

ystem.Net.HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(strFilename);

Taresh Uppal 7-Aug-12 5:38am

Now again a blank page is getting opened and code is showing no exception and dialogue box is not getting opened.
Here is my code:

System.Net.HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(strFilename);

System.Net.HttpWebResponse objResponse = (System.Net.HttpWebResponse)objRequest.GetResponse();
objRequest.ContentType = "application/json; charset=utf-8";
objRequest.Credentials = CredentialCache.DefaultCredentials;
try
{
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AppendHeader("Content-Disposition:", "attachment; filename=" + strFilename + "");
Response.AppendHeader("Content-Length", objResponse.ContentLength.ToString());
Response.ContentType = "application/download";
Response.Close();
Session.Remove("download_file_link");
Response.End();

}

Santhosh Kumar Jayaraman 7-Aug-12 5:40am

Please debug,. As i said earlier. I cant directly say the error without debugging. I dont have access to your machine.

Taresh Uppal 7-Aug-12 5:47am

don;t know, after using direct link, even my objRequest is not null. I guess I have to let it go with that old monotonous way. This issue is I guess bigger than me.:(

Taresh Uppal 7-Aug-12 5:52am

Anyways thanx a lot for all your code, help, support and patience on this issue. You are one of the best teammates I have ever seen. Thank you so much. Glad to follow your views.

Santhosh Kumar Jayaraman 7-Aug-12 5:53am

welcome