ODBC to mssql2008express

[LordQt]

Hello friends,

I have problem to connect to 2008 express Database.

static bool createConnection(QString driver= "QODBC",
                             QString connectionstr="DRIVER={SQL Server};"
                             "Server=IP\\Instance;Trusted_Connection=no;"
                             "Database=Databasename;Uid="";Pwd="";"
                            )
{
    QSqlDatabase db = QSqlDatabase::addDatabase(driver);
    db.setDatabaseName(connectionstr);
    db.setUserName("");
    db.setPassword("");
    if (!db.open()) {
        QSqlError err =  db.lastError ();
    	QMessageBox::information(0, QObject::tr("Cannot open database"), err.text());
        return false;
    }
     return true;
 
}

static bool createConnection(QString driver= "QODBC",
                             QString connectionstr="DRIVER={SQL Server};"
                             "Server=IP\\Instance;Trusted_Connection=no;"
                             "Database=Databasename;Uid="";Pwd="";"
                            )
{
    QSqlDatabase db = QSqlDatabase::addDatabase(driver);
    db.setDatabaseName(connectionstr);
    db.setUserName("");
    db.setPassword("");
    if (!db.open()) {
        QSqlError err =  db.lastError ();
    	QMessageBox::information(0, QObject::tr("Cannot open database"), err.text());
        return false;
    }
     return true;

}

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with this code I have no problem to Connect to mssql 2005 but with 2008 it doesn´t connect.

Have anybody an idea????