Recommendations Near Convention Center
Lunch: Reading Terminal Market for sure, although it can get obscenely crowded during big conventions. But there's something there for everybody. Rangoon or Vietnam Palace in Chinatown are good bets as well. XIX has an amazing lunch deal for $19 in a super-classy setting.
Avoid all the boring mediocre chains near the convention center like Maggianos, McCormick & Schmidt, Melting Pot, Chilis, Hard Rock, etc.
Tell us more what you're looking for and you'll get lots of good dinner recs. There are many good choices in the area.
Hard Rock Cafe
1000 Boardwalk, Atlantic City, NJ 08401
1601 Concord Pike Ste 47, Wilmington, DE 19803
There are dozens of good, unique restaurants in walking or short cab distance from the Convention Center, so no need to settle for a mediocre chain. OP needs to narrow the question to get quality responses.
Lunch at Reading Terminal Market is a no brainer, though. Go at least once.
Did you try searching the board first for "convention center?" This topic gets covered a lot. If there are specific things you want or don't want, ask away, because there are a lot of "good places" close to and within walking distance of the convention center.
The Reading Terminal Market and Chinatown are right there, so that could easily cover lunch and dinner. The 13th Street corridor has lots to choose from: Lolita, Bindi, Barbuzzo, Zavino, El Vez, Sampan, etc.