protected void btn_chamnhuanbut_click(object sender, EventArgs e)
 {
     foreach (DataGridItem m_Item in DataGrid_tinbai.Items)
     {
         TextBox txtsotientinbai = (TextBox)m_Item.FindControl("txtsotientinbai");
         TextBox txt_ghichu      = (TextBox)m_Item.FindControl("txt_ghichu");
         Label   lblMaTacGia     = (Label)m_Item.FindControl("lblMaTacGia");
         Label   lblsotientinbai = (Label)m_Item.FindControl("lblsotientinbai");
         Label   LabelGhichu     = (Label)m_Item.FindControl("LabelGhichu");
         double  id = double.Parse(DataGrid_tinbai.DataKeys[int.Parse(m_Item.ItemIndex.ToString())].ToString());
         if (txtsotientinbai.Text.Trim() != "" && lblMaTacGia.Text.Trim() != "")
         {
             Daltinbai.Sp_UpdateT_NhuanButTinbai(id, double.Parse(lblMaTacGia.Text), double.Parse(txtsotientinbai.Text.Trim().Replace(",", "")), 0, txt_ghichu.Text.Trim(), _user.UserID);
         }
         lblsotientinbai.Text    = txtsotientinbai.Text.Trim();
         LabelGhichu.Text        = txt_ghichu.Text.Trim();
         lblsotientinbai.Visible = true;
         LabelGhichu.Visible     = true;
         txtsotientinbai.Visible = false;
         txt_ghichu.Visible      = false;
     }
 }