Kamal
I tried about a year or so ago. Here are some tips:
1- Must have been 90 days since you have filed
2- Go there very early in the morning (around 6:30 AM)
3- Get a letter from HR stating that your continued work is important for their business
4- Take cash about $300.
5- You will first stand in the line outside, then in another line inside, then you will get a ticket from a window towards entrance, then you will wait for turn going into another window. That window will ask for a copy of I-485, your EAD receipt and the company letter. The officer there will most likely give you an appointment for another day.
6- On your appointment just simply show up a few minutes early. It will be a very small line, and you expect to be done in less than 3 hours.
7- All of this hassale will buy you a 90-day iEAD
Good Luck!