private void button3_Click(object sender, EventArgs e) { StudentService.StudentServiceClient client = new StudentService.StudentServiceClient("NetTcpBinding_IStudentService"); try { int id = Convert.ToInt32(textBox1.Text); StudentService.Student std = client.GetStudent(id); if (std != null) { std.Name = textBox2.Text; std.DateOfBirth = Convert.ToDateTime(textBox3.Text); std.Gpa = Convert.ToDouble(textBox4.Text); if (client.UpdateStudent(std)) { lblShow.Text = "Update Student Success."; } else { lblShow.Text = "Update Student Fail."; } } else { lblShow.Text = "Data Student Not Found."; } } catch (Exception er) { clearText(); lblShow.Text = "Error : " + er.ToString(); } }