using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace NonExtensionExample {

    class NonExtensionExample {

        static void Main(string[] args) {

            Console.WriteLine("NonExtensionExample.cs");
            Console.Write("Enter a number between 1 and 10 ==> ");

            int i = int.Parse(Console.ReadLine());

            Console.WriteLine("The value is {0} ",
                CheckExtensions.CheckRange(i, 1, 10) ? i.ToString() : "out of range");

            Console.Write("Enter of these values {CA | NY | TX | FL | NC} ==> ");
            String state = Console.ReadLine().ToUpper();

            Console.WriteLine("The state is {0} ",
                CheckExtensions.CheckValues(state, "CA", "NY", "TX", "FL", "NC") ? state : " not in the list");

            Console.WriteLine("End of tester");
            Console.ReadLine();
        }
    }

    /// <summary>
    /// Class that contains commonly used "check" methods to 
    /// perform DDS-like checking of data types.
    /// </summary>
    public static class CheckExtensions {

        /// <summary>
        /// Method that performs range checking feature for integer data.
        /// </summary>
        /// <param name="number">The integer value to check.</param>
        /// <param name="lowValue">The inclusive low value of the range to check.</param>
        /// <param name="highValue">The inclusive high value of the range to check.</param>
        /// <returns>Boolean indicating whether or not the value is within the range.</returns>
        public static bool CheckRange(int number,
                                      int lowValue,
                                      int highValue) {

            if ((number >= lowValue) && (number <= highValue)) { return true;  }
            else                                               { return false; }
        }

        /// <summary>
        /// Method that checks to see if a string value is in a list of values.
        /// </summary>
        /// <param name="testValue">The string value to check.</param>
        /// <param name="values">A comma-delimited list of string values that are the
        /// valid values.</param>
        /// <returns>Boolean indicating whether or not the value is in the list.</returns>
        public static bool CheckValues(String testValue,
                                       params String[] values) {

            if (values.Contains(testValue)) { return true;  }
            else                            { return false; }
        }
    }
}