protected void Submit_Click(object sender, EventArgs e)
 {
     dtoSanPham = new SanPham();
     bllSanPham = new SanPhamBLL();
     string fname = null;
     dtoSanPham.MaSX = Convert.ToInt32(TenSX.SelectedValue);
     dtoSanPham.TenSP = TenSP.Text;
     dtoSanPham.GiaBan = GiaBan.Text;
     dtoSanPham.PhanLoai = PhanLoai.SelectedValue;
     //Upload image
     HttpPostedFile file = Request.Files["FileUpload"];
     //check file was submitted
     if (file != null && file.ContentLength > 0)
     {
         fname = Path.GetFileName(file.FileName);
     }
     dtoSanPham.HinhAnh = fname;
     dtoSanPham.ChiTiet = Request.Form["ChiTiet"];
     if (bllSanPham.insertSanPham(dtoSanPham))
     {
         if (fname != null)
         {
             file.SaveAs(Server.MapPath(Path.Combine("../Images/", fname)));
         }
         Page_Clear();
         gvSanPhamBindData();
         lblMessage.Text = null;
         error.Text = "Thêm thành công!";
     }
     else
     {
         lblMessage.Text = null;
         error.Text = "Lỗi! Vui lòng thử lại.";
     }
 }
        protected void UpdateRecord(object sender, GridViewUpdateEventArgs e)
        {
            dtoSanPham = new SanPham();

            GridViewRow row = (GridViewRow)gvSanPham.Rows[e.RowIndex];
            dtoSanPham.MaSP = Int32.Parse(gvSanPham.DataKeys[e.RowIndex].Value.ToString());
            dtoSanPham.GiaBan = ((TextBox)row.Cells[4].Controls[0]).Text;
            dtoSanPham.HinhAnh = ((TextBox)row.Cells[6].Controls[0]).Text;
            dtoSanPham.ChiTiet = ((TextBox)row.Cells[7].Controls[0]).Text;

            try
            {
                bllSanPham.updateSanPham(dtoSanPham);
                error.Text = null;
                lblMessage.Text = "Cập nhật thành công!";
                // Refresh the data
                gvSanPham.EditIndex = -1;
                gvSanPhamBindData();
            }
            catch (Exception)
            {
                throw;
            }
        }