ADO.NET :: Want To Download A File From A Database Using LINQ To SQL?
Oct 26, 2010
I have used AsyncFileUpload AJAX control to upload a file to a column in a SQL Server database using LINQ to SQL. Below is the code. How do I retrieve the document and allow the user to save to local drive using a Save As Dialog box using LINQ to SQL? This is ASP.NET web application. The DocumentFileContent database column is a Image SQL Server data type.
var VRRRMDataDataContext = new VRRRMDataDataContext();
VRRRMWeb.AllUsers.Document custDocument = new VRRRMWeb.AllUsers.Document
{ DocumentFileName = AsyncFileUpload1.FileName, [code].....
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Apr 4, 2011
I had a download task in my project, which inserts files and downloads these files. I did my table in database and have a column which has the path of file and folder in project which will have the files. I did this well and my files insert well in folder and path in database. But I could not download these files from folder with the ID of path from database
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Mar 5, 2010
I have created a small website, which has a list of some customers database. Now, i want to back up the mdf file i used in the website, from the website itself by logging in as an adminstrator. when i am logged in as Admin and press a button called "DOWNLOAD", the download of the database file(.mdf) should start.
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Mar 23, 2010
I am trying to grab files from my database and allow the user to download it. I can generate an image or a text file, though they appear directly on the webpage with no downloading(i have comment this out) but I want to be able to download any kind of file right onto my computer. Any help? I was consider using memory stream but unsure on where
[Code]....
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Sep 19, 2010
How can I upload a file to a database (with as little code as possible!) along with a desciption of a file and then search through the descriptions to retrieve the appropriate files. Then how can I click on one and download it.I am not a very advanced programmer and would like full step by step code if possible not just a link to a website.
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Apr 5, 2010
I have made a database and uploaded a few different types of files. PNG files will download from the database but PDF & DOCX ones will not. Instead of downloading the app offers the ASPX page (download.aspx) to download.
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I have a binary file in database.How i can make a download of this file in header of page when a button is clicked
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Jul 23, 2010
I have file content in sql database as binary format and also saved the file with its extension .
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i.e if it .doc then it should get save in .doc format only. provide the code for the same.
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Jan 12, 2014
i am use this code for download..download is correct but after downlaod when open file type zip file or pdf see this error..jcoverflip-1.0.2.zip: The archive is either in unknown format or damaged
protected void LAtt_Click(object sender, EventArgs e)
{
string str = String.Empty;
Conn = new SqlConnection(ConfigurationManager.ConnectionStrings["bakerConnectionString"].ToString());
Cmd = new SqlCommand();
Cmd.CommandText = "SELECT * FROM Tcomplaint where id_complaint=@id_complaint";
[code]....
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Oct 26, 2012
I get this error when trying to download the file
Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.ID_LIT.View.GetData(SqlCommand cmd) at DotNetNuke.Modules.ID_LIT.View.Button4_Click(Object sender, EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
I am using this example from your site:
[URL]
here is my code:
Public Function GetData(ByVal cmd As SqlCommand) As DataTable
Dim dt As New DataTable
Dim strConnString As String = System.Configuration.ConfigurationManager.ConnectionStrings("mystring").ConnectionString
Dim con As New SqlConnection(strConnString)
Dim sda As New SqlDataAdapter
cmd.CommandType = CommandType.Text
cmd.Connection = con
[CODE]...
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Mar 3, 2011
I have struggled with this for the last 2-3 days. I have a tab container control with a update panel surrounding it. On one of the tabs I have allowed the user to upload and download files to a SQL Server database. The upload works fine and the download works fine only when I remove the update panel.
I have tried to implement the solution that's provided at the following location...http://encosia.com/2007/02/23/ajax-file-downloads-and-iframes/I had to modify the code a little bit to fit my scenario but it looks like it would work. Is there another way to download files from a database within a update panel?
If there isn't another way to do this what could be wrong with my code...following the example on the encosia site...
Page starting from [Code]....
The code never gets past the if statement with in this java script. Should I put a trigger on the update panel to force a post back. Any help will be appreciated, java script is not my strong point.
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Feb 9, 2011
I'm downloading a binary file from a SQL database to a client machine and want to instead download it to a folder on a server. THe code I'm using is below. How would I change the .AddHeader(I assume) to send the file to a folder on my server rather than the computer running the web page.Protected Sub download(ByVal dt As DataTable)
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Mar 10, 2010
I am a newbie of asp.net.
The environment is .net 3.5 and C#.
There are files stored in sql server (datatype of column is varbinary in the database).
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.
in folder B, there is two files B-1 and B-2.
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) )
to client side and let the user download.
after the download, the user can extract the compressed file and the structure of the folders and files keep unchanged.
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Sep 20, 2015
I want to download a file from database using asp.net c# code in page load event.My table design as below
Table Name: tblFiledownload
Id - int
Data - varbinary(MAX)
FileName - varchar(50)
FileExtension - varchar(50)
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May 2, 2010
I keep running into a problem when trying to connect to my web service. THe problem only occurs when I try to update the database linq to sql file. When I do this and then upload the wcf services and attempt to connect I get this error: Quote: The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error.
Server stack trace: at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMess age methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at IService1.GetPollById(Int32 pollId)
at Service1Client.GetPollById(Int32 pollId)
If I then revert back to the old linq to sql file it works fine.
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Jan 4, 2010
i am using amazon s3 service. now i want to show download dialog box in my asp.net application when user come on download page. i am using amazon sdk.
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Oct 13, 2010
I'm about to submit my pad file to multiple sharware sites but the pad file has to have a direct link to the download file and can't link to a download page which is what I would like to do, so I can track the traffic and get the downloader's email before allowing the download. I am running an ASP.NET site in VB. Is there a way to tell the web app to redirect to a specific aspx page when it receives a request for a specific file?
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Jun 10, 2013
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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Sep 2, 2013
I need to download a .mp3 file from a folder. during download a new blank page should open and after downloading it should close automatically.
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Dec 10, 2010
i m creating asp.net Mobile website page to download symbian .sis file to mobile ,but its not geting download properly.its working perfectly on desktop.
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Jul 26, 2010
I am downloading file from database using the following code. This code downloads an excel file from the database which has a macro attached to it when it is opened. This macro reads file name of the excel file and uses it for its computation. Everthing works file if user saves the file on his harddisk and then open if but if he directly opens the file from the dialog(by hitting 'Open' button) then file name of the opened excel file comes out be the name of the webform that has the above code and this leads to error in the macro. Is there any option through which i can control the name of the file if user directly opens the file from dialog or the option to disable or remove 'Open' button form the dialog?
[Code]....
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Nov 16, 2010
In our application, we allow user to upload documents which can be PDF, Doc, XLS, TXT. Uploaded documents will be saved on web server. We need to display link for each document user uploaded and when user click on that link, it should open relevant document. it is expected to have required software to open relevant documents.
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File.Copy(
sPath + dataReader["url"].ToString(),
Path.GetTempPath() + dataReader["url"].ToString(),
true);
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Mar 26, 2011
This below code i have used in my aspx page for file download.
Response.AppendHeader("content-disposition", "attachment; filename="" + emailAttachment.FileName + "";");
Response.ContentType = "application/octet-stream";
Response.OutputStream.Write(emailAttachment.Data, 0, emailAttachment.Data.Length);
Response.End();
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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Jan 14, 2013
I have made an application where I am displaying the .pdf , .doc , .docx files. These files are uploading from an Admin Panel.When user place a mouse pointer on download icon provided in front of every file, it shows the complete path where it’s get saved.I want to avoid this path visibility even when user place mouse on download icon and even if it Inspect an element (as most modern browser will have this functionality).
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Feb 1, 2011
I have a simple 'file download' generic handler which sets the response contenttype and headers before sending the file through the same response.
I also have Response.Cache.SetCacheability(HttpCacheability.server) set in the global.asax.
As I have noticed from various sources, Internet Explorer doesn't like this no-cache setting and gives an error when trying to download the file (requested site unavailable or cannot be found).
I thought maybe I could override this setting in the .ashx page, so I alter the response's cacheability setting to public. This did not solve the issue. removing the line from global.asax does solve the problem but obviously affects the whole site.
Is there a way of setting the cachability just for my generic handler?
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