从一个数据库表复制到另一个C#

using System;
using System.Data.SqlClient;

class Program
{
    static void Main(string[] args)
    {
        string sourceConnectionString = "Data Source=source_server;Initial Catalog=source_database;Integrated Security=True";
        string targetConnectionString = "Data Source=target_server;Initial Catalog=target_database;Integrated Security=True";

        using (SqlConnection sourceConnection = new SqlConnection(sourceConnectionString))
        using (SqlConnection targetConnection = new SqlConnection(targetConnectionString))
        {
            sourceConnection.Open();
            targetConnection.Open();

            using (SqlCommand sourceCommand = new SqlCommand("SELECT * FROM source_table", sourceConnection))
            using (SqlDataReader sourceReader = sourceCommand.ExecuteReader())
            using (SqlCommand targetCommand = new SqlCommand("INSERT INTO target_table (column1, column2, column3) VALUES (@column1, @column2, @column3)", targetConnection))
            {
                targetCommand.Parameters.AddWithValue("@column1", SqlDbType.NVarChar, 50);
                targetCommand.Parameters.AddWithValue("@column2", SqlDbType.NVarChar, 50);
                targetCommand.Parameters.AddWithValue("@column3", SqlDbType.NVarChar, 50);

                while (sourceReader.Read())
                {
                    targetCommand.Parameters["@column1"].Value = sourceReader["column1"];
                    targetCommand.Parameters["@column2"].Value = sourceReader["column2"];
                    targetCommand.Parameters["@column3"].Value = sourceReader["column3"];

                    targetCommand.ExecuteNonQuery();
                }
            }
        }
    }
}