How to add CommandTimeout to connection string in web.config

I made it like this:

private readonly MyDbContext _context;

    public LinqToSql() : this(new MyDbContext())
    {
    }

    private LinqToSql(MyDbContext context)
    {
        _context = context;
        _context.CommandTimeout = 500; 

    }

As far as I know there is no global way of setting Command timeout property, you have to set CommandTimeout property individually for each command object you create.