Question

I store few pdf files in my db as binary format using the below code in my controller,

    [HttpPost]
    public ActionResult Index(HttpPostedFileBase file)
    {
        Image newImage = new Image();
        newImage.MimeType = file.ContentType;          

        var binaryReader = new BinaryReader(file.InputStream);
        newImage.Data = binaryReader.ReadBytes(file.ContentLength);
        binaryReader.Close();
        objImage.InsertImage(newImage.Data);

        return View();

    }

now i want to download them back based on the id passed to the contrller that pdf files should be downloaded??

this is my code for pdf download, wat do i need to add more

    public ActionResult Download(int id)
    {
        DataSet da = new DataSet();

        da = objImage.getUserImage(id);
        DataTable dt = new DataTable();
        dt = da.Tables[0];
        Byte[] imagedata=(Byte[])dt.Rows[0]["UsImage"];



    }

Answer 1

this is my code for pdf download, wat do i need to add more

Return an ActionResult:

public ActionResult Download(int id)
{
    ...
    byte[] imagedata = (byte[])dt.Rows[0]["UsImage"];
    return File(imagedata, "image/png");
}

and if you want the browser to popup a Save As dialog instead of displaying the image inline specify a filename:

public ActionResult Download(int id)
{
    ...
    byte[] imagedata = (byte[])dt.Rows[0]["UsImage"];
    return File(imagedata, "image/png", "foo.png");
}

Obviously the MIME type and the filename could come from your database as well. In this example I have hardcoded them but you could adapt this code.