how to send gridview containing image via email using asp.net c#

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C#

ASP.NET

I have to send the Gridview containing image column to the email and the image displayed in gridview from database Image is stored in database not in local folder its getting all details in mail except Image. Please Guide me to solve this problem.
my code as follows:

public void SendHTMLMail()
   {
       MailMessage Msg = new MailMessage();
       lblcomfirmationmail.Text = Session["Useremail"].ToString();
       Msg.From = new MailAddress(lblcomfirmationmail.Text);
       Msg.To.Add(lblcomfirmationmail.Text);
       Msg.Subject = "Your Order Details";
       Msg.Body += "Please check below data <br/><br/>";
       Msg.Body += GetGridviewData(Gridorderconfirmation);
       Msg.IsBodyHtml = true;
       Msg.BodyEncoding = Encoding.UTF8;
       SmtpClient smtp = new SmtpClient();
       smtp.Host = "smtp.gmail.com";
       smtp.Port = 587;
       smtp.Credentials = new System.Net.NetworkCredential("venmanirsalimited@gmail.com", "");
       smtp.EnableSsl = true;
       smtp.Send(Msg);
   }
   public string GetGridviewData(GridView gv)
   {
       StringBuilder strBuilder = new StringBuilder();
       StringWriter strWriter = new StringWriter(strBuilder);
       HtmlTextWriter htw = new HtmlTextWriter(strWriter);
       gv.RenderControl(htw);
       return strBuilder.ToString();
   }
   public override void VerifyRenderingInServerForm(Control control)
   {

   }
protected void Payimgbtn_Click(object sender, ImageClickEventArgs e)
   {
       SendHTMLMail();
       Response.Redirect("~/Payment.aspx");
   }

Image Template in Gridview
<asp:TemplateField HeaderText="Item" ItemStyle-Width="20%" ItemStyle-BorderStyle="Dotted" >
<ItemTemplate>
<asp:Image ID="image" runat="server" ImageUrl='<%# "Handler.ashx?ImID=" + Eval("ProductID")%>' Width="100" Height="100" />
</ItemTemplate>
</asp:TemplateField>

Handler.ashx

public void ProcessRequest (HttpContext context) {
        MemoryStream memoryStream = new MemoryStream();
        string imageid = context.Request.QueryString["ImID"];
        con.Open();
        SqlCommand command = new SqlCommand("select ProductImage from rsa_ProductItemTable where ProductID=" + imageid, con);
        SqlDataReader dr = command.ExecuteReader();
        dr.Read();
        context.Response.BinaryWrite((Byte[])dr[0]);
        con.Close();
        context.Response.End();
    }