string[,] NameAndScore = new string[8, 2] { { "景珍", "90" }, { "林惠洋", "65" }, { "成蓉", "88" }, { "洪南昌", "70" }, { "龍玉民", "46" }, { "單江開", "81" }, { "田武山", "100" }, { "王三明", "68" }};
int sum = 0;
float avg;
for(int i = 0; i < NameAndScore.GetLongLength(0); i++)