How to generate a random number only once in C#

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C#

First of all, I would like to thank Code Project for helping me out in my quest to learn C#. I started learning to the programme as a hobby and picked c# as I heard that it is quite easy to learn for a person without any programming background. However, I realised that it is still too tough for me. But Code Project has always helped me out in figuring things out. Anyways...

So I was trying to write a C# console app that displays animation on the console. So far I'm able to write about 95% of the code and it is working but I'm still not able to figure out how to generate a random number from list of number only once. I have included the code I have written for everyone to review. Right now I have to use a redundant method for making sure that all the characters are printed on the console. Which consumes a lot of time and i guess memory too. Below is my code. Please excuse me if the code seems hard to read as It is been only about 1.5months since when i started with c#.

If anyone can suggest me what I can do to remove the redundant Iteration number from my code then I guess it will be complete.

<pre>
using System;
using System.IO;
using System.Threading;

namespace BeautifulNameAnimation
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please play in maximised window mode. PRESS ENTER after maximising your window");
            Console.ReadKey();
            Console.WriteLine("Please enter the complete path of your text file including the text file name with extension: ");
            Console.ForegroundColor = ConsoleColor.Magenta;
            Console.Write(">>> ");
            Console.ResetColor();
            string path = Console.ReadLine();
            Console.WriteLine("Provide animation delay number. Bigger the number Slower the animation.");
            Console.ForegroundColor = ConsoleColor.Magenta;
            Console.Write(">>> ");
            Console.ResetColor();
            int animDelay = int.Parse(Console.ReadLine());
            Console.WriteLine("Redundancy Number: (This number decides the iteration for animation) -- Start with 1000 and then gradually increase it. ");
            Console.ForegroundColor = ConsoleColor.Magenta;
            Console.Write(">>> ");
            Console.ResetColor();
            int redundencyCounter = int.Parse(Console.ReadLine());
            Console.Clear();

            //// Program Execution Stage -1
            int[] Method1Output = ReturnColsAndRows(path);
            //// Program Execution Stage -2
            char[,] Method2Output = ExtractAllChars(Method1Output, path);
            //// Program Execution Stage -3 (Final OutPut)
            PrintTextFile(Method2Output, animDelay, redundencyCounter);
            Console.ResetColor();
            Console.ReadKey();
        }
        //Method No. 1
        #region Method for calculating Rows and Colums in the Source Text File.
        public static int[] ReturnColsAndRows(string path)
        {
            StreamReader reader = new StreamReader(path);
            int cols = reader.ReadLine().Length;
            int rows = 1;
            string line = reader.ReadLine();
            while (line != null)
            {
                rows++;
                line = reader.ReadLine();
            }
            reader.Close();
            int[] rowsNcols = new int[2] { rows, cols }; //To be used in Method No. 2 for Char[,]
            return rowsNcols;
        }
        #endregion
        //Method No. 2
        #region Method for extracting individual characters from Source Text File.
        public static char[,] ExtractAllChars(int[] Method1Output, string path)
        {
            StreamReader reader = new StreamReader(path);
            string line = reader.ReadLine();
            char[,] charsInSourceFile = new char[Method1Output[0], Method1Output[1]];
            for (int row = 0; row < charsInSourceFile.GetLength(0); row++)
            {
                for (int col = 0; col < charsInSourceFile.GetLength(1); col++)
                {
                    charsInSourceFile[row, col] = line[col];
                }
                line = reader.ReadLine();
            }
            reader.Close();
            return charsInSourceFile;
        }
        #endregion
        //Method No. 3
        #region Method for printing extracted chars in a random fashion
        public static void PrintTextFile(char[,] charsInSourceFile, int animDelay, int redundencyCounter)
        {
            int counter = 0;
            Random rand = new Random();
            while (true)
            {
                int row = rand.Next(charsInSourceFile.GetLength(0));
                int col = rand.Next(charsInSourceFile.GetLength(1));
                Console.SetCursorPosition(col, row);
                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.Write(charsInSourceFile[row, col]);
                counter++;
                Thread.Sleep(animDelay);
                if (counter == redundencyCounter) // This is the problem
                {
                    Console.SetCursorPosition(0, charsInSourceFile.GetLength(0) + 2);
                    break;
                }
            }
        }
        #endregion
    }
}

What I have tried:

I tried to google my question by not able to find any solution