problema de seguridad c#

[pablokes]

using System;
using System.Collections.Generic;
using System.Text;
using System.Data.SqlClient;
using System.Data;
using System.Collections;
using System.Security.Cryptography;

namespace Sistema_Cuentas_Corrientes.Login
{

class ConexionSql
{
private SqlConnection cnn;
public ConexionSql()
{

this.cnn = new SqlConnection("Data Source=PROLIANT;Initial Catalog=Prueba;User ID=sa;Password=Proliantml350");
this.cnn.Open();
}
}

en q parte de ahi?? no te entiendo man ;P