I created a webpage where a PDF file will be displayed after a QR code has been scanned. When the QR code is scanned it shows a URL and when the URL is clicked it redirects to the page where the PDF file will show.

It shows in laptop and desktop devices but when I used a mobile phone to scan the QR code and navigate to the URL, the PDF file did not show.

I used Handler.ashx I don't know if Handler.ashx can show on a mobile deivce.

Here is the page where the Pdf will show

HTML

<div class="container" id="centered" style="margin: 0 auto; padding: 5px; font-family: Nunito; border: 1px solid #d9dde4;">
    <div class="form-horizontal">
        <div class="contentt">
            <asp:Literal ID="ltEmbed" runat="server" />
        </div>
    </div>
</div>

MY Handler.ashx 

public class Receipt : IHttpHandler {

    public void ProcessRequest (HttpContext context)
    {
        int id = int.Parse(context.Request.QueryString["Id"]);
        byte[] bytes;
        string contentType;
        string constr = "MyConnectionString";
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand())
            {
                cmd.CommandText = "SELECT * FROM Table WHERE Id=@Id";
                cmd.Parameters.AddWithValue("@Id", id);
                cmd.Connection = con;
                con.Open();
                using (SqlDataReader sdr = cmd.ExecuteReader())
                {
                    sdr.Read();
                    bytes = (byte[])sdr["image"];
                    contentType = sdr["Contyp"].ToString();
                }
                con.Close();
            }
        }

        context.Response.Buffer = true;
        context.Response.Charset = "";
        context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
        context.Response.ContentType = contentType;
        context.Response.BinaryWrite(bytes);
        context.Response.Flush();
        context.Response.End();
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

C#

    protected void Page_Load(object sender, EventArgs e)
    {
        if (Session["receipt"] != null)
        {
            BindCardAndQR();
        }
    }

    public string ToAbsoluteUrl(string relativeUrl)
    {
        if (string.IsNullOrEmpty(relativeUrl))
        {
            return relativeUrl;
        }
        if (relativeUrl.StartsWith("/"))
        {
            relativeUrl = relativeUrl.Insert(0, "~");
        }

        if (!relativeUrl.StartsWith("~/"))
        {
            relativeUrl = relativeUrl.Insert(0, "~/");
        }

        var url = HttpContext.Current.Request.Url;
        var port = url.Port != 80 ? (":" + url.Port) : String.Empty;

        return String.Format("{0}://{1}{2}{3}", url.Scheme, url.Host, port, VirtualPathUtility.ToAbsolute(relativeUrl));
    }

    private void BindCardAndQR()
    {
        if (Session["receipt"] != null)
        {
            int id = Convert.ToInt32(Session["receipt"]);

            string sql = "SELECT * FROM Table WHERE Id = @Id";
            SqlParameter[] parameters = new[] { new SqlParameter("@Id", id) };

            // Bind Image3 for Card Image
            DataTable dt = SelectFromDatabase(sql, parameters);

            string embed = "<object data=\"{0}{1}\" type=\"application/pdf\"></object>";
            ltEmbed.Text = string.Format(embed, ResolveUrl("Handler.ashx?Id="), id);

            byte[] QRBytes = GetQRCodeBytes(ToAbsoluteUrl("~/UIDocument.aspx?Id=" + id));
            Image1.ImageUrl = "data:image/jpg;base64," + Convert.ToBase64String(QRBytes);
        }
    }

    public byte[] GetQRCodeBytes(string url)
    {
        //QR code generated here
        QRCodeEncoder encoder = new QRCodeEncoder();
        Bitmap bi = encoder.Encode(url);
        MemoryStream tmpSteam = new MemoryStream();
        bi.Save(tmpSteam, ImageFormat.Jpeg);
        return tmpSteam.ToArray();
    }
    public static DataTable SelectFromDatabase(string sql, SqlParameter[] parameters)
    {
        using (SqlConnection con = new SqlConnection("MyConnectionString"))
        {

            using (SqlCommand cmd = new SqlCommand(sql, con))
            {
                if (parameters != null)
                {
                    cmd.Parameters.AddRange(parameters);
                }

                using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
                {
                    DataTable dt = new DataTable();
                    sda.Fill(dt);
                    return dt;
                }
            }
        }
    }