visualstudio 和sql

有哪位巨佬知道错lable16的值为什么不显示吗
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace staffmanager
{
public partial class Main1 : Form
{
public Main1()
{
InitializeComponent();
}
string Id;
public void GetId(string id)
{
label16.Text = id;
label16.Refresh();
Id = id;
}
internal void GetENo(string username)
{
throw new NotImplementedException();
}

    private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)    {    }    private void label7_Click(object sender, EventArgs e)    {    }       private void button1_Click(object sender, EventArgs e)    {        Application.Exit();    }    private void Main1_Load(object sender, EventArgs e)    {               // TODO: 这行代码将数据加载到表“managementDataSet.Employee_info”中。您可以根据需要移动或删除它。        this.employee_infoTableAdapter.Fill(this.managementDataSet.Employee_info);        string name, sex, dept, tel;        string connString = "Data Source=DESKTOP-0M0CC8Q;Initial Catalog=management;Integrated Security=True";//数据库连接字符串        SqlConnection conn = new SqlConnection(connString);//创建connection对象        conn.Open();//打开数据库                     //创建数据库命令         SqlCommand cmd = conn.CreateCommand();        //创建查询语句         cmd.CommandText = "select * from Employee_info where ENo ='" + Id + "'";        //从数据库中读取数据流存入reader中         SqlDataReader reader = cmd.ExecuteReader();        //从reader中读取下一行数据,如果没有数据,reader.Read()返回flase         while (reader.Read())        {                        name = reader.GetString(reader.GetOrdinal("Ename"));            sex = reader.GetString(reader.GetOrdinal("Esex"));            tel = reader.GetString(reader.GetOrdinal("EPhone"));            dept = reader.GetString(reader.GetOrdinal("DNo"));                                   label7.Text = name;            label7.Refresh();            label8.Text = sex;            label10.Text = tel;            label9.Text = dept;            break;        }        reader.NextResult();//执行下一句操作                                  reader.Close();                   }    private void tabPage2_Click(object sender, EventArgs e)    {    }    private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)    {    }}