What are the most dangerous areas on kl?

As they are mainly around after dark, stay home at those times.

Dark time means night time
All entertainment are available in only night. Please tell dangerous areas in kl for moving single.

KL is a huge huge area - where are you planning to live?

Near to sprang, selegor

If you mean Sepang, that is near to the airport. I don't know anything about that area. Its not really part of KL.

As a rule of thumb, anywhere there are foreigners with money and alcohol available, there is a risk of dangerous situations.

What are you afraid they will do to you?

All areas dangerous now if walking. Obviously walking with a laptop bag is bound to end up in a mugging these days for example.

I do as Malaysians. Drive everywhere with no valuables left on seat etc (as smash window and grab with motorcycles common).

Risk of being killed/raped etc though is probably lower than western cities (apart from car accidents).

Don't hunt for 'services' in Jalan Bukit Bintang at night.
Place is full of nasty pimps and everything that goes with that rubbish.

No real problem to walk down there, but make sure your wallet is well inside your pocket.
I keep a small amount of cash in one place for use, but all my cards and main cash well out of sight.