StructurePractice7

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace StructurePractice7 {
    struct Product {
        public string ID, Name;
        public double Price;
        public int Qty;
        public double Total;
    }
    static class Program {
        static void Main() {
            line();
            int productCount = readInputRange("\b\b\b\b\b\bHow many product to input",1,9999);
            line();
            Console.WriteLine("INPUT {0} DATA OF PRODUCT TO STRUCTURE",productCount);
            line();
            Product[] products = new Product[productCount];
            double sum = 0;
            for (int i = 0; i < products.Length; i++) {
                products[i].ID = readLine("product ID");
                products[i].Name = readLine("product Name");
                products[i].Price = readInputRange("product Price", 0.0, double.MaxValue);
                products[i].Qty = readInputRange("product Quant", 0, int.MaxValue);
                products[i].Total = products[i].Price * products[i].Qty;
                sum += products[i].Total;
                line();
            }
            Console.WriteLine();
            Console.WriteLine("{0,-5}{1,7}{2,7}{3,7}{4,7}{5,7}","No.","ID","NAME","PRICE","QUANT","TOTAL");
            line();
            for (int i = 0; i < products.Length; i++) {
                Console.WriteLine("{0,-5}{1,7}{2,7}{3,7}{4,7}{5,7:n0}",i+1,products[i].ID, products[i].Name, products[i].Price, products[i].Qty, products[i].Total);
            }
            line();
            Console.WriteLine();
            Console.WriteLine("All Total price of {0} product = {1:n} Baht.",productCount,sum);
            Console.ReadKey();
        }
        static void line() {
            Console.WriteLine("---------------------------------------------------------------------");
        }
        static int readInputRange(string name, int min, int max) {
            int num;
            while (true) {
                try {
                    Console.Write("Input {0} : ", name);
                    num = int.Parse(Console.ReadLine());
                } catch (Exception) {
                    num = min - 1; //Workaround
                }
                if ((num >= min && num <= max)) {
                    return num;
                } else {
                    Console.SetCursorPosition(40, Console.CursorTop - 1);
                    Console.ForegroundColor = ConsoleColor.DarkRed;
                    Console.WriteLine("Invalid Input!!!");
                    Console.ResetColor();
                }
            }
        }

        static double readInputRange(string name, double min, double max) {
            double num;
            while (true) {
                try {
                    Console.Write("Input {0,-15} : ", name);
                    num = double.Parse(Console.ReadLine());
                } catch (Exception) {
                    num = min - 1;
                }
                if ((num >= min && num <= max)) {
                    return num;
                } else {
                    Console.SetCursorPosition(40, Console.CursorTop - 1);
                    Console.ForegroundColor = ConsoleColor.DarkRed;
                    Console.WriteLine("Invalid Input!!!");
                    Console.ResetColor();
                }
            }
        }
        static string readLine(string name) {
            Console.Write("Input {0,-15} : ", name);
            return Console.ReadLine();
        }

        static int readInputNumber(string name) {
            while (true) {
                try {
                    Console.Write("Input {0,-15} : ", name);
                    return int.Parse(Console.ReadLine());
                } catch (Exception) {
                    Console.SetCursorPosition(40, Console.CursorTop - 1);
                    Console.ForegroundColor = ConsoleColor.DarkRed;
                    Console.WriteLine("Invalid Input!!!");
                    Console.ResetColor();
                }
            }
        }
    }
}
/*Input
3
125-89
Pen
5.5
560
126-78
Book
12.5
100
127-43
Candy
3
20
*/