c# update,该如何处理

c# update
我的这个页面是一个修改页面
页面的内容是获取上个页面textbox的值显示出来的，用的是textbox
内容可以添加或者修改，我的cs代码页写好了，也没有错误，但是就是没有反应
麻烦各位帮我看下有什么问题
protected void Button1_Click(object sender, EventArgs e)
  {
  if (Session["ABC"] != null)
  Label44.Text = Session["ABC"].ToString();

  string x = Label44.Text;

  string z = TextBox1.Text;

  string b = TextBox2.Text;

  string c = TextBox3.Text;

  string d = TextBox4.Text;

  string s = TextBox5.Text;

  string k = TextBox6.Text;

  string g = TextBox7.Text;

  string f = TextBox8.Text;

   
  string i = TextBox9.Text;

  string y = TextBox10.Text;

  string m = TextBox11.Text;

  string n = TextBox12.Text;

  string o = TextBox13.Text;

  string p = TextBox14.Text;
  string q = TextBox15.Text;

  string r = TextBox16.Text;
  string t = TextBox17.Text;

  OleDbConnection conn = new OleDbConnection();
  conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|db1.mdb";
  OleDbCommand comm = new OleDbCommand();
  conn.Open();
  comm.Connection = conn;

  comm.CommandText = "UPDATE [userdetail] SET [username]='" + z + "',[sex]='" + b + "',[age]='" + c + "',[nativeplace]='" + d + "',[tel]='" + s + "',[email]='" + k + "',[xueli]='" + g + "',[school]='" + f + "',[position]='" + i + "',[english]='" + y + "',[jybj]='" + m + "',[gzjl]='" + n + "',[zytc]='" + o + "',[zycg]='" + p + "',[jtqk]='" + q + "',[xqah]='" + r + "',[qzyx]='" + t + "' WHERE [tel] ='" + x + "'";

  comm.Parameters.AddWithValue("@username", z);
  comm.Parameters.AddWithValue("@sex", b);
  comm.Parameters.AddWithValue("@age", c);
  comm.Parameters.AddWithValue("@nativeplace", d);
  comm.Parameters.AddWithValue("@tel", s);
  comm.Parameters.AddWithValue("@email", k);
  comm.Parameters.AddWithValue("@xueli", g);
  comm.Parameters.AddWithValue("@school", f);
  comm.Parameters.AddWithValue("@position", i);
  comm.Parameters.AddWithValue("@english", y);
  comm.Parameters.AddWithValue("@jybj", m);

  comm.Parameters.AddWithValue("@gzjl", n);
  comm.Parameters.AddWithValue("@zytc", o);
  comm.Parameters.AddWithValue("@zycg", p);
  comm.Parameters.AddWithValue("@jtqk", q);
  comm.Parameters.AddWithValue("@xqah", r);
  comm.Parameters.AddWithValue("@qzyx", t);

  comm.ExecuteNonQuery();
  conn.Close();
   






  }
}



------解决方案--------------------------------------------------------

探讨

你既然用的参数化，sql语句这样写
comm.CommandText = "UPDATE [userdetail] SET [username]=@username";//后面也一样

还有你确定数据库连接字符串写对了