Connect To .DataSource=.... Using Authetication (userid && Passphrase)!

Hi,

My school is runnnig SQL Server 2005 and i want to connect to it using authetication (userid & passphrase). As i coded the windows application i used localhost as my own computer and IntegratedSecurity shown below. I'm new in C# and SQL. I would appriciate if someone could help me out.

using System;
using System.Data;
using System.Data.SqlClient;
using System.Text;

namespace Personregister
{
class DBManager
{
SqlConnection conn;
SqlConnectionStringBuilder builder;

public DBManager()
{
builder = new SqlConnectionStringBuilder();
builder.DataSource="localhost";
builder.InitialCatalog = "Personregister";
builder.IntegratedSecurity = true;
conn = new SqlConnection(builder.ToString());

}
// more code fallows ......
}
}

Best Regards,