How to create a screensaver in Core C#

This program was written as an old style screensaver as a part of a training course. The screen saver is a simple program which uses random numbers to display dots on screen in different colors. It also uses a simple logic to keep removing dots by overwriting them with blank spaces, so that the screen does not fill up. There is a for loop to slow down the appearance of dots, i.e., stars.
This code is not the last code, suggestions and improvements are welcome.
Note: The % operator is used to generate actual randomness on screen, using many if-elses. Only later was it discovered that one can also pass a seed number for effective random values.
Note: This program generates only 10000 times. One can also pass a command line argument to run the loop indefinitely and prompt user to press Control+c to exit from the program.

using System;
class set_cursor2
int lastnum;

private int RandomNumber(int min, int max)
Random random = new Random();
lastnum = random.Next(min, max);

if (lastnum%3 == 0 || lastnum%4==0 )
lastnum = random.Next(min, max);

if (lastnum%5 == 0 || lastnum%6==0 || lastnum%7==0 )
lastnum = random.Next(min, max);

return lastnum;

static void Main(string[] args)
set_cursor2 obj = new set_cursor2();
int lastrow,lastcol;
int i,j,t;
Console.BufferHeight = 500;
Console.BufferWidth = 200;
Console.CursorSize = 50;
Console.CursorVisible = true;

i = 1;
j= obj.RandomNumber(1,99);
Console.CursorLeft = j;
lastcol = j;
j= obj.RandomNumber(1,49);
lastrow = j;
Console.CursorTop = j;
if (i%3 == 0)
Console.ForegroundColor = ConsoleColor.White;
else if (i%4 == 0)
Console.ForegroundColor = ConsoleColor.Cyan;
Console.ForegroundColor = ConsoleColor.DarkBlue;

if ((i+j) % 2 == 0 || (i+j) % 3 == 0 || (i+j) % 5 == 0)
Console.WriteLine(" ");

// Console.WriteLine(". {0} {1}",lastrow,lastcol);

while (i<=10000);
Console.WriteLine("\n\n Finish");

Anyone can use the color codes to change the layout of the screen. The following are some popular color codes:

Color Description
Black The color black.
Blue The color blue.
Cyan The color cyan (blue-green).
DarkBlue The color dark blue.
DarkCyan The color dark cyan (dark blue-green).
DarkGray The color dark gray.
DarkGreen The color dark green.
DarkMagenta The color dark magenta (dark purplish-red).
DarkRed The color dark red.
DarkYellow The color dark yellow (ochre).
Gray The color gray.
Green The color green.
Magenta The color magenta (purplish-red).
Red The color red.
White The color white.
Yellow The color yellow.


28 responses to this post.

  1. Posted by Nakshtra Choudhary on March 9, 2012 at 4:32 pm

    Seems a very old style of code and standards, can you develop it in new way?

  2. Posted by Nakshtra Choudhary on March 9, 2012 at 4:33 pm

    actually using this my system seems to be feeling headache, so please make it low memory consuming.

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