Display Image on the page after click

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ASP.NET

Good Afternoon.
I am workin on online shopping project.
My productDetails.aspx code is like :

protected void Button1_Click(object sender, EventArgs e)
  {

      SqlConnection con = new SqlConnection("Data Source=.\\sqlexpress;initial catalog=pankshi;integrated security=true");

      SqlCommand cmd = new SqlCommand("insert into tbl_addtocart" + "(productcode,bname,imgpath,cost,qty,totcost)" + "values" + "(@productcode,@bname,@imgpath,@cost,1,@totcost)",con);
      cmd.Parameters.Add(new SqlParameter("@productcode",Labelproductcode .Text ));
      cmd.Parameters.Add(new SqlParameter("@bname", Labelbrandname.Text));
      cmd.Parameters.Add(new SqlParameter("@imgpath", "~/Handler.ashx?Pid=" + ImageId));
      cmd.Parameters.Add(new SqlParameter("@cost", Labelcost.Text));
      cmd.Parameters.Add(new SqlParameter("@totcost", Labelcost.Text));
      try
      {
          con.Open();
          cmd.ExecuteNonQuery();
          con.Close();
          Response.Redirect("addtocart.aspx");
      }
      catch (SqlException ex)
      {

          string errorMessage = "Error in registering user";

          errorMessage += ex.Message;

          throw new Exception(errorMessage);



      }

      finally
      {

          con.Close();

      }
  }

but my imagespath not saved as usual.therefpre my image are not shown in my addtocart.aspx page.

My addtocart.aspx is like

protected void Page_Load(object sender, EventArgs e)
   {
       SqlConnection con = new SqlConnection("Data Source=.\\sqlexpress;Initial Catalog=pankshi;integrated security=True;");
       con.Open();
       sql = "select * from tbl_addtocart";
       ds = new DataSet();
       da = new SqlDataAdapter(sql,con);
       da.Fill(ds,"tbl_addtocart");
       GridView1.DataSource = ds;
       GridView1.DataBind();
   }

please give me right soluton.