我可以在运行时将ConnectionStrings添加到ConnectionStringCollection吗？

using System.Configuration;
using System.Data.SqlClient;

// 获取现有的连接字符串集合
ConnectionStringSettingsCollection connectionStrings = ConfigurationManager.ConnectionStrings;

// 创建一个新的连接字符串
ConnectionStringSettings newConnectionString = new ConnectionStringSettings("MyNewConnectionString", "Data Source=myServerAddress;Initial Catalog=myDataBase;User ID=myUsername;Password=myPassword", "System.Data.SqlClient");

// 将新的连接字符串添加到集合中
connectionStrings.Add(newConnectionString);

// 保存更改
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
config.ConnectionStrings.ConnectionStrings.Clear();
foreach (ConnectionStringSettings connectionString in connectionStrings)
{
    config.ConnectionStrings.ConnectionStrings.Add(connectionString);
}
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("connectionStrings");