Coding Conundrum 3.1: Fish List

using System;
using System.Collections.Generic;

public class Program
{
    public struct Fish
    {
        public string Name;
        public int Weight;

        public Fish(string inName, int inWeight)
        {
            Name = inName;
            Weight = inWeight;
        }

        public override string ToString()
        {
            return String.Format("{0} at {1}g", Name, Weight);
        }
    }

    public static List<Fish> FishList = new List<Fish>();

    public static int totalWeight;

    public static void Main(string[] args)
    {
        int i = 1;
        while(true)
        {
            string inFishName = ReadString(String.Format("Enter fish {0}'s name: ", i));

            if(inFishName.ToLower() == "finished")
                break;

            int inFishWeight = ReadNumber(String.Format("Enter fish {0}'s weight (in grams): ", i));

            FishList.Add(new Fish(inFishName, inFishWeight));

            Console.WriteLine("Fish added.");
        }

        /// calculate the statistics ///
        // variable declaration
        Fish heaviestFish = FishList[0];
        Fish lightestFish = FishList[0];

        foreach(Fish currentFish in FishList)
        {
            if (currentFish.Weight > heaviestFish.Weight)
                heaviestFish = currentFish;
            if (currentFish.Weight < lightestFish.Weight)
                lightestFish = currentFish;

            totalWeight += currentFish.Weight;
        }

        // Print out the statistics calculated above
        Console.WriteLine("Total weight: {0}", totalWeight);
        Console.WriteLine("Heaviest fish: {0}", heaviestFish.ToString());
        Console.WriteLine("Lightest fish: {0}", lightestFish.ToString());
    }

    /// <summary>
    /// Reads a string in from the user.
    /// </summary>
    /// <param name="prompt">The prompt to display</param>
    /// <param name="minlength">The minimum length of the input the user enters.</param>
    /// <returns>The string the user entered.</returns>
    public static string ReadString(string prompt, int minlength = 1)
    {
        while(true)
        {
            Console.Write(prompt);
            string line = Console.ReadLine();
            if(line.Length < minlength)
            {
                Console.WriteLine("Please enter something that is at least {0} characters.");
                continue;
            }

            return line;
        }
    }

    /// <summary>
    /// Reads a number from the user.
    /// </summary>
    /// <remarks>Depends on ReadString()</remarks>
    /// <param name="prompt">The prompt to display to the user.</param>
    /// <returns>The number that the user entered</returns>
    public static int ReadNumber(string prompt)
    {
        while(true)
        {
            string line = ReadString(prompt).Trim();
            try {
                return int.Parse(line);
            }
            catch
            {
                Console.WriteLine("Sorry, that was not a valid number.");
            }
        }
    }
}