You mean like this?

var m_sContent = string.Join("\n", sqlreader.Select(x => Compose(x.odID, x.ontorequest, x.wouldLike)));

Or this?

var m_sContent = string.Join("\n", sqlreader.Select(x => string.Format("constblaconstblacnsta{0}ocnstbla{1}asfloaksf{2}constbla", x.odId, x.ontorequest, x.wouldLike)));

Or this?

Func<dynamic,string> compose = x => string.Format("{0} {1} {2}", x.odId, x.ontorequest, x.wouldLike));
var m_sContent = string.Join("\n", sqlreader.Select(compose));

Seriously. C# has got you covered.

Thanks, but it seems too unreadable to me, and my production leaders would not be happy about this habit, plus, I myself am not quite getting it, I think I am getting old :(. Also, the last example seems to be a rather instance of function that gets disposed out of the block, if I am not mistaken, I would rather have possibility to immediately define a function in the scope of the class, so it would not be:
redefintiion able, instance utilized... and so on. Thanks, it seems that this practice is not very common upon programers, and it did not get maintained to level of effective and reasonable usage .

My mistake I posted in Lounge, cannot rate you up, this was very profesional help! Thanks!

Thanks, but it seems too unreadable to me, and my production leaders would not be happy about this habit, plus, I myself am not quite getting it, I think I am getting old . Also, the last example seems to be a rather instance of function that gets disposed out of the block, if I am not mistaken, I would rather have possibility to immediately define a function in the scope of the class, so it would not be:

redefintiion able, instance utilized... and so on. Thanks, it seems that this practice is not very common upon programers, and it did not get maintained to level of effective and reasonable usage .

It's actually quite common with modern C# programmers. I use lambda's quite frequently.