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How to download an Excel file

I want to download an Excel sheet to my specific location not to Download folder.
I tried below code. Then the file is download to the "Download" folder. I need to download this file to a given file path.
string filepath = "D:\";
string strDownloadableFilename = "Test.xlsx"
Using (MemoryStream stream = ExportExcel()){
Response.Clear();
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", strDownloadableFilename));
stream.WriteTo(Response.OutPutStream); ;
Response.End();
}
The file is download to "Download" folder.

Well there are two things
first of all what you want to achieve can't be done by downoad option it means we can read file and write in system memory as per our desired location but in that case No download popup will see so you have to decide if you need download popup and no desired location or vice versa.

Creating a hyperlink to a physical path on the local PC, to files not part of the web site

I have some files in a folder on the harddrive, like C:\ExtraContent\ that has some PDF files. This folder is not part of the website. I was able to successfully upload a PDF to this folder using the default ASP.NET FileUploader, no problem.
What I would like to do is, create a hyperlink that links to a PDF in that folder C:\ExtraContent\somePDF.pdf
I am able to get close using a Button with the following code:
protected void Button1_Click(object sender, EventArgs e)
{
WebClient client = new WebClient();
Byte[] buffer = client.DownloadData("C:\ExtraContent\somePDF.pdf");
Response.ContentType = "application/pdf";
Response.AddHeader("content-length", buffer.Length.ToString());
Response.BinaryWrite(buffer);
}
The above works in terms of opening the file. But I can't get this to work with an ASP.NET HyperLink.
The reason I want to use a HyperLink is so that the user can choose to right-click and Save As, to download a copy. If HyperLink controls can only link to relative paths, what can I do to get my desired result?
Note: making the files I'm trying to access part of the site is not practical for us.

Basically allowing access to the folder the way you describe is a real security risk (because it requires hacking at the permissions), isn't trivial and in general should be avoided. The way that you achieve your desired behaviour is something along these lines.
Firstly create a blank aspx or ashx page.
Secondly, either in the Page_Load or ProcessRequest you want to use code along the following lines
string filePath = "c:\\Documents\\Stuff\\";
string fileName = "myPath.pdf";
byte[] bytes = System.IO.File.ReadAllBytes(filePath + fileName);
context.Response.Clear();
context.Response.ContentType = "application/pdf";
context.Response.Cache.SetCacheability(HttpCacheability.Private);
context.Response.Expires = -1;
context.Response.Buffer = true;
context.Response.AddHeader("Content-Disposition", string.Format("{0};FileName=\"{1}\"", "attachment", fileName));
context.Response.BinaryWrite(bytes);
context.Response.End();
I haven't tested this and taken it from my head so it might need some tweeks but the above code should get you on the right track to cause the persons browser to begin downloading the file you provide.
EDIT: I just realized (after rereading your question) your problem was slightly different to what I thought, to get your issue resolved simply make the hyperlink button you are using link to a page that can process the request as described above. IE: An ashx or aspx page

You need to create a hyperlink to a page that acts as a 'proxy' so that the page will return a response that contains the file stream.
You cannot create a link to a file that is not prt of your site.

Code to Download file

I have to give one option in my website to upload multiple files and then allowing users to download those files.
I have done uploading multiple files part, however I am not much clear how I will do downloading part.
I first thought to add hyperlinks dynamically to a label for each file (as I am not sure how many files user will upload).
But then it opens file in browser and does not give option to save or open file.
Main issue is user can submit any type of file like ms doc or xls or text files etc Hence content type is not fixed.
I am not clear on how exactly I will do it I mean adding link buttons dynamically or adding hyperlinks dynamically. And after that how will I download file? I am not able to do
Response.WriteFile(Server.MapPath(#"~/logo_large.gif"));
as content type is not clear.
Please help me regarding code for download all types of files

for download the file:
public void DownLoad(string FName)
{
string path = FName;
System.IO.FileInfo file = new System.IO.FileInfo(path);
if (file.Exists)
{
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.WriteFile(file.FullName);
Response.End();
}
else
{
Response.Write("This file does not exist.");
}
}
but this is for word doc/docx files. in the line: Response.ContentType = "application/octet-stream"; you have to define the type of the file.
for displaying hyperlink dynamically write a loop and go over all the files which were uploaded by the user and writh the following code:
yourdivId += "<a href='" + file.FullName + "' >" + file.Name + "</a></br>";

Hope this will help u.()
Response.Clear();
Response.ContentType = YourFile.ToString();
Response.AddHeader("Content-Disposition", "attachment;filename=" + YourFileName);
Response.OutputStream.Write(YourFile, 0, YourFile.Length);
Response.Flush();
Response.End();
I have tried this to download img,txtfile,zip file,doc it works fine..
but little problem user will face that in my case when i opened a word(doc) file its ask
me to openwith..? when i select MsWord it opened it correctly.
For showing these file you can make a grid view to show all file with a download link...

Actually you can follow different ways.
Guide the user during upload and make him specify the file type before starting upload. So the user has to select the content type from a selection. You need to save the correlation between the file and its content type.
Create a map between file extensions and mime-types (See here for example). You need to obtain the file extension and save the correlation between that file and its content type.
Try to identify the content type automatically. There is a Windows
API that let you identify the Mime Type of a file. And here is some code.
After that, you can use st mnmn solution.

You can do it like this:
try
{
string strURL=txtFileName.Text;
WebClient req=new WebClient();
HttpResponse response = HttpContext.Current.Response;
response.Clear();
response.ClearContent();
response.ClearHeaders();
response.Buffer= true;
response.AddHeader("Content-Disposition","attachment;filename=\"" + Server.MapPath(strURL) + "\"");
byte[] data=req.DownloadData(Server.MapPath(strURL));
response.BinaryWrite(data);
response.End();
}
catch(Exception ex)
{
}

You'll have to set few response headers before server sends the file to client. See How to Download a file with a hyperlink

save as dialog in asp.net

I have some data in the form of a string. I want to write this data to a file and save the file to the specified path. The path would be specified by opening a save as dialog on the button click. How can this be achieved??

The file is saved into the server initially with this code
string getnote = txtdisplay.Text.Trim();
String filepath = Server.MapPath(#"img\new1.txt");
System.IO.FileStream ab = new System.IO.FileStream(filepath, System.IO.FileMode.Create);
System.IO.StreamWriter Write101 = new System.IO.StreamWriter(ab);
Write101.WriteLine(getnote);
Write101.Close();
Response.ClearContent();
From the server get the file as attachment.Use the following code for save as dialog box for downloading or saving the file. The file will save by default in the download folder. To save to the specified location change the browser settings.
Response.ContentType = "text";
Response.AppendHeader("Content-Disposition", "attachment; filename=new1.txt");
Response.TransmitFile(Server.MapPath("~/img/new1.txt"));
Response.End();

Response.ContentType = "application/octet-stream" (or content type of your file).
Response.AppendHeader("content-disposition", "attachment;filename=" & strFileName)

There is no Save As dialog in ASP.NET.
Remember, your ASP.NET application is running in a browser on a user's computer. You have no access to the user's file system, including the Save As dialog.
However, if you send the user a file, as an attachment, most browsers will display a dialog asking the user whether to save the file or open it. Maybe the user will choose to save it. That's what the example from phoenix does.

You could use a LinkButton (or regular link) and have the url point to a handler (ASHX) that retrieves the data and sends back a response with content disposition set to attachment. Write the data to the response. You'll also need to set up some other headers in the response -- such as content type and length. This would give the document (file) a regular link that could perhaps be bookmarked (if a regular link) in the future so that it can be retrieved again. You'd need to pass enough data in the query string to be able to identify which data is to be downloaded.

if I userstand you correctly, here -
saveFileDialog1.DefaultExt = "*.file";
saveFileDialog1.Filter = "File|*.file|Other File|*.OFile|";
if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
saveFileDialog1.FileName.Length > 0)
{
WebClient wc = new WebClient();
wc.DownloadFile("http://www.exaple.com/exaplefile", saveFileDialog1.FileName);;
}

Creating and saving a text file from a c# ASP.NET app

I want to be able to create a text file and let the user save this to their own PC. Currently i have to do this:
StreamWriter sw;
sw = File.CreateText("C:\\results.txt");
Which obv saves on the web server but how can I replace that string with a link to their own computer? I looked at SaveFileDialog but it seems to only work for Windows Forms and not ASP sites, any advice?
Thanks in advance

You need to tell the Users Browser to Download the file. You can use the following code:
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType="text/plain";
Response.AppendHeader( "content-disposition", "attachment; filename=" + filename );
Response.AppendHeader( "content-length", fileContents.Length );
Response.BinaryWrite( fileContents );
Response.Flush();
Response.End();
Where fileContents is a byte[] of the files contents. and filename is the name of the file to suggest to the user.

You need to write an ASPX (or ASHX) page that sends your data down the wire, and add a Content-Disposition header.

You can stream the file to their browser. Here is a good article.

You need to save the file to a publicly accessible path and then present the user with a link to the file.