protected void btnEdit_Click(object sender, EventArgs e) { string MaMH = ""; if (Request.QueryString["MaMH"] != null) { MaMH = Request.QueryString["MaMH"]; } MonHoc.MonHoc_Update(txtTenKhoa.Text, Convert.ToInt32(txtTinChi.Text), Convert.ToInt32(MaMH)); Response.Redirect("Coursemanagement.aspx"); Response.Write("<script>alert('Sửa thành công')</script>"); }