Requesting Visa
Case # and Visa # is Different. You need to understand the whole process. Once the consulate gets all the papers from you, they contact INS and request for the visa number. If your case gets approved, you get the same visa. If it is rejected, the consulate let the INS know about that. It is like COnsulate saying to INS that I need this many visa of this category - this is how INS keep track of all the visas and immigration issues.