save as dialog in asp.net

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);;
        }