绑定数据库的问题！

string id = "1";
        string nr = TextBox1.Text.ToString();
        SqlConnection conn = new SqlConnection(strConn);
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;
         = "update jianjie set neirong='"
                + nr + "'where ID='"
                + id + "'";
        conn.Open();
        cmd.ExecuteNonQuery();
        conn.Close();
我要更新好数据后 绑定数据 让textbox显示更新后的新数据！如何绑定？？