Array
(
    [dirname] => .
    [basename] => Validator.cs
    [extension] => cs
    [filename] => Validator
)
1. file=./Validator.cs<br>
2. file=.//Validator.cs<br>
3. file=Validator.cs<br>
<?php // Save this file as: ./Validator.cs ?>
namespace ProductMaintenance
{
    public static class Validator
    {
        public static string LineEnd { get; set; } = "\n";

        public static string IsPresent(string value, string name)
        {
            string msg = "";
            if (value == "")
            {
                msg = $"{name} is a required field.{LineEnd}";
            }
            return msg;
        }

        public static string IsDecimal(string value, string name)
        {
            string msg = "";
            if (!Decimal.TryParse(value, out _))
            {
                msg = $"{name} must be a valid decimal value.{LineEnd}";
            }
            return msg;
        }

        public static string IsInt32(string value, string name)
        {
            string msg = "";
            if (!Int32.TryParse(value, out _))
            {
                msg = $"{name} must be a valid integer value.{LineEnd}";
            }
            return msg;
        }

        public static string IsWithinRange(string value, string name, decimal min,
            decimal max)
        {
            string msg = "";
            if (Decimal.TryParse(value, out decimal number))
            {
                if (number < min || number > max)
                {
                    msg = $"{name} must be between {min} and {max}.{LineEnd}";
                }
            }
            return msg;
        }
    }
}