Hi Felishanand,
Thanks for using Syncfusion EJ2 components.
We have checked your requirement for “dropdownlist datasource not bind inside dialog component”. This is a known issue, and fixed in dialog component which will be available in our upcoming release Vol1 2018 and it will be rolled out by the mid of Feb. We will let you know once it has been rolled out.
Regards,
Gopi G.