Web Forms :: How To Write Code For Download A File

Feb 10, 2011

I have web page, in that I place some links(hyperlinks or linkbuttons).

each button, when user clicks then a file should be downloaded to the user system..

files that are to be downloaded exists in asp.net website project folder>>downloads folder.

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Mar 10, 2010

I am a newbie of asp.net.

The environment is .net 3.5 and C#.

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each record is in one record in that table (FILE_TABLE).

And there is another table (PATH_TABLE) to store the files paths.

for example,

when the user download the folder A (select an item on the tree and click a button on the client side),

there is one sub-folder B and two files A-1 and A-2.

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then, at the code behind (server), the server will get the files from the database and convert them (including the files and subfolders) to a .zip file (or other compressed files)

and then write a response (using the method HttpResponse.BinaryWrite(Byte[] xxx) )

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Mar 11, 2010

I am a newbie of handling memory.

in my web apps, files are stored as varbinary in sql server.

my goal is to make a response to let users to download the files.

if there is a file (500 MB) stored in one record in the sql server,

what is the best way to let users download it?

I found that , in code-behind, if the files are loaded as byte[] objects, it uses the memory.

for example, the datalength of a file in the database is 500 MB.

the byte[] for this file uses 500 MB memory. am I correct?

how about the filestream? if the file is loaded as a filestream object in code-behind.s

does it also take 500 MB memory?

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[code]....

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{
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[code]...

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Mar 20, 2010

here's the code so far:

[Code]....

[Code]....

mov is a quicktime file, my server has the mimetype: video/quicktime .......... but as I read, this code forces the save as download box which is exactly what i want :) now, here's the catch, i the file I am fetching is NOT on the physical path... it is on a completely different server:Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LinkButton1.Click
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If Not IsDBNull(ext) Then
ext = LCase(ext)
End If
Select Case ext
'Case ".htm", ".html"
' type = "text/HTML"
'Case ".txt"
' type = "text/plain"
'Case ".doc", ".rtf"
' type = "Application/msword"
'Case ".csv", ".xls"
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[Code]....

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I have added linkbutton inside gridview to download, below is my code..

protected void lnkDownload_Click(object sender, EventArgs e)
{
try
{

[Code].....

its giving me following error

"Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack"

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Mar 11, 2011

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Web Forms :: Can't Start File Download From Server Side Using .aspx File In IE7

Mar 26, 2011

This below code i have used in my aspx page for file download.

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This block of code display Download file Dialog for Open or Save the attached file.It's working fine in Mozila Firefox and IE8 but doesn't display Download file Dialog box in IE 7

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Web Forms :: Secure File Download / Hide File Path And Location While Downloading Files

Jan 14, 2013

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Jun 24, 2010

I've a gridview which I am rendering to a html text writer and allowing clients to download as an excel spreadsheet using Response.Write. I'm using AJAX in my website now and suddenly it stopped working. This is the code I'm using

public static void Convert(DataSet ds, HttpResponse response)
{
try
{
//1. declare filename to export
string filename = "export";
//2. clear response object
response.Clear();
response.Charset = "";
//3. set response mime type to excel
response.ContentType = "application/vnd.ms-excel";
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response.AppendHeader("content-disposition", "attachment; filename=" + filename + ".xls");
//5. create a string writer
StringWriter stringWrite = new StringWriter();
//6. create html writer which uses the string writer
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//7. instantiate a gridview
GridView gv = new GridView();
//8. set gridview datasource to the dataset
gv.DataSource = ds.Tables[0];
//9. bind gridview
gv.DataBind();
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gv.RenderControl(htmlWrite);
//11. output html
response.Write(stringWrite.ToString());
//12. end response
response.End();
}
catch (Exception ex)
{
string str = ex.Message;
}
}

I've found that Response.Write doesn't work with AJAX. Are there any alternatives to this?

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