Partial Page Refresh after Download of file or using of Response.end in aspx page using iframe

Initially Declare a generic Handler like this

    public class Handler1 : IHttpHandler

    {

        #region IHttpHandler Members

        private HttpContext _context;

        private HttpContext Context

        {

            get

            {

                return _context;

            }

            set

            {

                _context = value;

            }

        }

        public void ProcessRequest(HttpContext context)

        {

            Context = context;

            string filePath = context.Request.QueryString["path"];

            filePath = context.Server.MapPath(filePath);

            if (filePath == null)

            {

                return;

            }

            System.IO.StreamReader streamReader = new System.IO.StreamReader(filePath);

            System.IO.BinaryReader br = new System.IO.BinaryReader(streamReader.BaseStream);

            byte[] bytes = new byte[streamReader.BaseStream.Length];

            br.Read(bytes, 0, (int)streamReader.BaseStream.Length);

            if (bytes == null)

            {

                return;

            }

            streamReader.Close();

            br.Close();

            string extension = System.IO.Path.GetExtension(filePath);

            string fileName = System.IO.Path.GetFileName(filePath);

            WriteFile(bytes, fileName, "application/" + extension, context.Response);

        }

        /// <summary>

        /// Sends a byte array to the client

        /// </summary>

        /// <param name="content">binary file content</param>

        /// <param name="fileName">the filename to be sent to the client</param>

        /// <param name="contentType">the file content type</param>

        private void WriteFile(byte[] content, string fileName, string contentType, HttpResponse response)

        {

            response.Buffer = true;

            response.Clear();

            response.ContentType = contentType;

            response.AddHeader("content-disposition", "attachment; filename=" + fileName);

            response.BinaryWrite(content);

            response.Flush();

            response.End();

        }

        public bool IsReusable

        {

            get

            {

                return false;

            }

        }

        #endregion

    }

}

Next declare an iframe in aspx page (design)

<iframe id="iframe1 " style="display: none" runat="server" ></iframe>

and an update panel

<asp:UpdatePanel ID="UpdatePanel1 " runat="server" UpdateMode="Conditional">

                        <ContentTemplate>

//controls design goes here

//Lets assusme we have a GridView1 here

</ContentTemplate>

</asp:UpdatePanel>

Next in aspx codebehind file write code as follows:

Some EventHandler()

{

//Method to bind GridView1 data

UpdatePanel1.Update();

   string path="Handler1.ashx?path=" + "declare your path here";

    iframe1.Attributes["src"] = path;

}

We are done:

Now we can see the page is partially refreshed when we called that event.