如何将多个数据库值返回到textboxes？

using System;
using System.Data.SqlClient;
using System.Windows.Forms;

// 假设已经建立了一个名为"connectionString"的数据库连接字符串

try
{
    // 连接到数据库
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        connection.Open();

        // 编写SQL查询语句
        string sqlQuery = "SELECT column1, column2, column3 FROM tableName";

        // 执行查询并获取结果
        using (SqlCommand command = new SqlCommand(sqlQuery, connection))
        {
            using (SqlDataReader reader = command.ExecuteReader())
            {
                // 遍历结果集并将值赋给textboxes
                while (reader.Read())
                {
                    textbox1.Text = reader["column1"].ToString();
                    textbox2.Text = reader["column2"].ToString();
                    textbox3.Text = reader["column3"].ToString();
                }
            }
        }
    }
}
catch (Exception ex)
{
    MessageBox.Show("发生错误：" + ex.Message);
}