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Amazon S3 - MS office files corrupted when downloading

When I upload a docx, xlsx or pptx to amazon S3 using aws .net sdk the file is getting uploaded fine and I am able to view the file directly from S3 without any issues. But when I download the file in ASP.net using C# I am getting a warning message (see below) when opening the file:
"Excel found unreadable content in test.xlsx. Do you want to recover the contents of this workbook?" If I click yes, I am able to see all the contents in the document.
similarly I am getting a warning message for .docx file as well.
This is the C# code I am using:
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.AddHeader("content-disposition", "attachment; filename=" + fileName);
Response.OutputStream.Write(Content, 0, Content.Length);
Response.Flush();
HttpContext.Current.ApplicationInstance.CompleteRequest();
Update: When I download the file in windows forms app it is working fine and the problem is with web app only.
What am I doing wrong?
Please help...

More information is needed to figure this out. The code snippet you provided looks OK. The problem looks to be elsewhere in your code... For example, what are you loading inside "Content"?
Also, it would help if you tried uploading and downloading a simple text file, to see what kind of data gets appended.

If Content is a byte[] created from a MemoryStream, make sure you're calling .ToArray() and not .GetBuffer() to get it. If you use .GetBuffer(), you'll potentially get extra bytes on the end, which the office file format probably doesn't like. Your other file types you've tried it with might be more tolerant of extra data they weren't expecting on the end.

Save image to disk on a button click in a Web page

I have some images in my Asp.net web page. My requirement is to save a selected image to users disk while clicking a save button.Normally all browser has the provision for right click save as option.But I have to implement this feature on an html input button click. I have the following questions.
How can I make a script to do this functionality which should work on all major browsers
Do we get any jQuery library which does this functionality
Can I get any alternative in asp.net technology rather than java script/jQuery for doing the same functioanlity
Can anyone please help me?

jQuery is a client-side javascript library. It is not involved with serving files to download.
You can provide a download on any button click in asp.net. jQuery is not required for downloading files.
Your code in the event handler would look as follows:
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", string.Format("attachment; filename=\"{0}\"", fileName));
Response.WriteFile(filePath + fileName);
Response.Flush();
Response.End();

You cannot write a file straight to disk from a website, period. That's just sensible security. A regular download link/button will always invoke the standard download process of the browser, in which you have no say whether the file will be saved at all or where to. The only way to circumvent that is to create a native browser plugin which the user will have to install first, which will write files from your site straight to a specific location on disk. Please be extremly careful writing such a plugin should you do so so it does not become a gaping security hole for everybody.

Response.TransmitFile corrupting file

I have a file on my server or well in this localhost. I want to transmit it to user using this code:
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-Disposition", "attachment; filename=buylist.pdf");
Response.TransmitFile(Server.MapPath("~/buylist.pdf"));
Response.ContentType = "application/csv";
Response.AppendHeader("Content-Disposition", "attachment; filename=buylist.csv");
Response.TransmitFile(Server.MapPath("~/buylist.csv"));
I know the file I am trying to transmit our fine and I even tried adding Response.Close() but each time the file is corrupted. The csv give me the page's HTML. I am really lost.

Try putting a Response.Clear() at the top of this code, and a Response.End() and bottom.
Also, it looks like you're trying to transmit two files in one response, and that just won't work. It might also be two versions of the code showing in the same snippet in your question, but this is still worth mentioning: You need to pick one file to return in one response. If you absolutely must return two files at once, you'll have to zip or tar them together first. There is no way to send two files with the same response.

Folder Browser Dialog Box in ASP.Net

I've created a word document generator in C sharp and I want that generated word document to be save in a specific place in the client. I'm looking for a similar functionality like FolderBrowserDialog in Windows Form. I'm using ASP.Net and I tried may solutions but still no luck. Anyone can help me.

No! server (web-app) program don't have an ability to save a generated document at specific place at client.

try to use the HttpResponse in behind's code:
like:
// Clear the content of the response
Response.ClearContent();
// Add the file name and attachment, which will force the open/cancel/save dialog box to show, to the header
Response.AddHeader("Content-Disposition", "attachment; filename=" + savedNameWithExtension);
// Add the file size into the response header
Response.AddHeader("Content-Length", myfile.Length.ToString());
// Set the ContentType
Response.ContentType = ReturnExtension(myfile.Extension.ToLower());
// Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
Response.TransmitFile(myfile.FullName);
// End the response
Response.End();
This section of code will prompt the user to save the specified file on a certain location on his machine.
Hope this is clear.

When you download a file from the browser its the browser to show the save file dialog and this works on all browsers and on all platforms. Just keep the default behavior and let users decide location and file name. I guess any hacky implementation of that part if possible at all, it is likely to break in some browsers or platforms, like mac, ipad, android...
you do not need to specify any control to be used, once you call the methods to download a file like
Response.WriteFile or Response.BinaryWrite or any other, the browser takes care of everything else for you and let it be like that ;-)

Issue opening doc/docx/excel files in browser(Asp.net, C#)

I am storing some files like PDF, Doc, Docx, xls etc. in the file system.
Now I have to show those files on the browser for the users to view.
So basically a link button is there in a datagrid, upon clicking on which the user will be able to view.
So far my code goes like this
Response.Clear();
// Response.ContentType = "application/pdf";
//Response.ContentType = "application/x-msexcel";
//Response.ContentType = "application/msword";
string strFilePath = #"C:\test.pdf";
// string strFilePath = #"C:\test.doc";
Response.WriteFile(strFilePath);
Response.End();
This works fine for pdf files but fails for word or excel files. In the browser I am able to view the pdf but the other files are not opening in browser but are asking for the
Save , Open dialog box option. If I click on Open, it will open in a normal window instead of browser.
How can I achieve my target? The browser is IE
Thanks in advance

have you tried adding something like this?
Response.AppendHeader("Content-Disposition", "inline;filename=" + "ExcelFile.xls");

There may be a browser configuration issue.
Try changing some settings in the browser(Custom Level).
Launching programs and files in an Iframe
Launching applications and unsafe files.
etc