ADO Database C#

using System;
using System.Data.SqlClient;
class MainClass {
    public static void Main(string[] args) {
        string conString = @"Data Source=.\sqlexpress;" +
            "Database=Northwind;Integrated Security=SSPI;" +
            "Min Pool Size=5;Max Pool Size=15;Connection Reset=True;" +
            "Connection Lifetime=600;";
        SqlConnectionStringBuilder sb1 = new SqlConnectionStringBuilder(conString);
        Console.WriteLine("  Min Pool Size = " + sb1.MinPoolSize);
        SqlConnectionStringBuilder sb2 = new SqlConnectionStringBuilder(conString);
        sb2.MinPoolSize = 5;
        Console.WriteLine("  " + sb2.ConnectionString);
    }
}