private void button1_Click(object sender, EventArgs e) { String studentCode = cboMaSV.Text; if (studentCode != null) { if (!studentCode.Equals("Choose Student")) { dgwKetQua.DataSource = SinhVienDAO.GetStudentResultByStudentCode(studentCode).Tables[0]; DataRow[] selectedRow = SinhVienDAO.GetStudentInformationByStudentCode(studentCode).Tables[0].Select(string.Format("MASV='{0}'", studentCode)); txtSurName.Text = selectedRow[0]["HOSV"].ToString(); txtName.Text = selectedRow[0]["TENSV"].ToString(); txtDOB.Text = selectedRow[0]["NGAYSINH"].ToString(); txtSex.Text = selectedRow[0]["GIOITINH"].ToString(); txtCourseCode.Text = selectedRow[0]["MAKH"].ToString(); } } }