MySqlConnection conn;
    string connStr = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;

    public Connection()
    {
        conn = new MySqlConnection(connStr);
    }

 <connectionStrings>
<add name="myConnectionString"
 connectionString="server=localhostdatabase=store;user=root;
 password=pass;port=3306" />
 </connectionStrings>
    public Connection()
    {
        conn = new MySqlConnection(connStr);
    }