public static void Main()
string[] id = new string [10];
string[] name = new string [10];
string[] Lastname = new string[10];
Console.WriteLine("Menu");
Console.WriteLine("press 1 Input member [10]");
Console.WriteLine("Press 2 show number of members");
Console.WriteLine("Press 3 show all member");
Console.WriteLine("Press 4 Exit");
Console.WriteLine("Press enter menu :");
string menu = Console.ReadLine();
Console.WriteLine("your choose 1st menu" );
Console.Write("input student id{0}:",count+1);
id[count] = Console.ReadLine();
Console.Write("input name{0} :",count+1);
name[count] = Console.ReadLine();
Console.Write("input Lastname{0}",count+1);
Lastname[count] = Console.ReadLine();
Console.WriteLine("your choose 2nd menu");
Console.WriteLine("{0}members",count);
Console.WriteLine("your choose 3rd menu");
for (int i=0;i<count;i++)
Console.WriteLine("{0}.{1} {2} {3}",i+1,id[i],name[i],Lastname[i]);
Console.WriteLine("your choose 4th menu");
Console.WriteLine("Please enter 1-4 menu only. .");