C#

using (MemoryStream memoryStream = new MemoryStream())
{

    document.Save(memoryStream, false);

    memoryStream.Position = 0;


    Session["BinaryData"] = memoryStream.ToArray();

    ScriptManager.RegisterStartupScript(this, this.GetType(), "openPDF", "javascript:window.open('../../Service/Pages/Page2.aspx');", true);

    Response.Redirect('../../Service/Pages/Page3.aspx');
}

protected void Page_Load(object sender, EventArgs e)
       {
           if (Session["BinaryData"] != null)
           {

               Response.Clear();
               Response.ContentType = "application/pdf";
               Response.AddHeader("Content-Disposition", "inline; filename=" + filename);
               ////Write the MemoryStream to the Response.
               Response.BinaryWrite((byte[])Session["BinaryData"]);
           }