In a large bowl, combine the cake mix, pudding mix, oil and eggs; beat on low speed or 30 seconds. Beat on medium for 2 minutes. Gradually beat in soda just until blended., Pour into a greased 13x9-in. baking dish. Bake at 350degrees for 40-45 minutes or until a toothpick inserted in the center comes out clean., In a small bowl, combine the confectioners' sugar and lemon juice until smooth; carefully spread over warm cake. Cool on a wire rack.