Combine 1 cup water and 1/2 teaspoon salt in a large, heavy saucepan; bring to a boil. Add rice to pan. Cover, reduce heat, and simmer 20 minutes or until liquid is absorbed. Fluff with a fork.
Combine remaining 1/2 teaspoon salt, juice, oil, pepper, and garlic in a large bowl. Add rice and beans; toss to coat. Let stand 15 minutes or until completely cool. Stir in corn and cilantro.