1)Frnds tell me that is there any Lock statement in SQL?-Yes or No.

2)In my interview i was asked,What is deadlock??? But i dont know?Can u tell me out?

3)Then they ask me about the Lock.I answer Lock ensures that when one thraed is in critical section ,no other thraed is allowed to enter in critical section.If another thraed attempts to enter a blocked code,It will wait.
Plz tell me that my above answer is correct or wrong????

4)Is there any concept of deadlock in VB.Net???Yes or no