static void DeleteClass()
{
int id;
string idTry;
while (true)
{
Console.WriteLine("Please Enter The ID of Class: ");
idTry = Console.ReadLine();
try
{
id = Int32.Parse(idTry);
if (icb.ClassIsExists(id))
{
icb.DeleteClass(id);
Console.WriteLine("Delete Class Successful!");
}
else
{
Console.WriteLine("Delete Error, Class ID Is Not Exists!");
}
break;
}
catch (Exception e)
{
Console.WriteLine("Class ID Must Be A Number!");
continue;
throw;
}
}
}