NO. Danios are fast shoaling fish who will not only stress a betta with their darting about, but are very well known for being fin nippers. If you already have the betta, he may take the addition of Danios as an intrusion on his territory and attack them.
There's always someone who has a placid betta and has made it work in some way, but these are not to be taken as the normality. One or two people making it work does not mean it works as a general principle. 
Male Bettas are, on the whole not community fish. They are called fighting fish for a reason and the name does not only extend to just other male bettas. Tank mates are not a necessity and often not worth the risk. 
Also, if your tank is less than 10 gallons you have no space for any tankmates other than shrimp. Danios in particular are active fish and actually require more than 10 gallons and a group of at least 8.