SqlDataReader getSqlDataReader(String ^_sql)
{
    SqlDataReader ^_sqlDataReader = nullptr;

    SqlConnection ^_connection = gcnew SqlConnection();

    ConnectionStringSettings ^connectionSettings = ConfigurationManager::ConnectionStrings["AppDefaultConnection"];
    this->_connection->ConnectionString = connectionSettings->ConnectionString;

    try {
        this->_connection->Open();
    }

    catch (Exception ^_exception)
    {
        Console::WriteLine("Error : "  + _exception->Message);
        return nullptr;
    }

    try
    {
        SqlCommand ^_sqlCommand = gcnew SqlCommand(_sql,_connection);
        _sqlDataReader = _sqlCommand->ExecuteReader();
    }

    catch(Exception ^_exception)
    {
        Console::WriteLine("Error : "  + _exception->Message);
        return nullptr;
    }

    return _sqlDataReader;
}

SqlDataReader ^reader = getSqlDataReader(yourParameterizedQueryString);

        List<TypeToFetch>^ data = gcnew List<TypeToFetch^>();
        if(reader != nullptr && reader->HasRows)
        {
            TypeToFetch^ typeToFetch = gcnew TypeToFetch();
            while(reader->Read())
            {
                    // example
                TypeToFetch->id = (int) reader["Id"];
                TypeToFetch->name = reader["Name"]->ToString();
                data->Add(typeToFetch);
            }
        }