如何在没有id的情况下从asp.net visual studio中的数据库填充文本框？

using System;
using System.Data.SqlClient;

public partial class YourPage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string connectionString = "YourConnectionString"; // 替换为你的数据库连接字符串
            string query = "SELECT columnName FROM tableName"; // 替换为你的查询语句

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(query, connection);
                connection.Open();
                SqlDataReader reader = command.ExecuteReader();

                if (reader.Read())
                {
                    textBox.Text = reader["columnName"].ToString(); // 替换为你的文本框控件ID
                }

                reader.Close();
            }
        }
    }
}