It depends on which country you are visiting.
Usually you need to go back to your home country and to apply again for visa.Once your visa is expired you can no longer have it extended.
Nope. You have to leave the country and apply for another visa at the Consular Officer abroad.
go to the embassy of Singapore in India or any travel agent who can apply on your behalf
If your I94 expires without renewal, then there is not legal time-frame. You are considered out of status the day after your I-94 expiration date. Further H2B status and employment is less likely...
steal itHow can i apply Pakistan visa in New Delhi?