How to code a live number raffling system using VB.NET

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im trying to make an application using vb.net
an app that can raffle 1 to n. but not just raffle it, it'll show many random numbers first before showing the last final random number.
is it possible to code it?
i tried many codes from the internet but it most codes show the number immediately after a button click

i tried also using the timer so that every time the timer ticks the number changes but its not random, it will pick from an array. and do it from 1 to n . not randomly.

did any body tried this kind of codes?

What I have tried:

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Randomize()
        TextBox1.Text = Int(Rnd() * 75)
     





    End Sub
End Class

Posted 24-Jun-21 23:05pm

Beginner213456

Updated 24-Jun-21 23:27pm

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OriginalGriff · Answer 1 · 2021-06-24T23:27:00

The simplest way is to actually emulate the way a tombola / lottery draw machine works.
It has a container which holds all the numbers in the competition, and rotates un=til one drops out.

So create a List(Of Integer) and fill it with all the numbers you can have. If there are 10 "balls" in play, put the numbers 1 to 10 in there.
Then generate a random number in the collection - use the Random class to select a number between 0 and the number of items in the List minus one, then use that as an index into teh List. That value will be your "winner".
Then in your timer, you generate another random number oto access an item from the List, get the value, and remove it from what is left in the collection.
If that matches your winner, it's over. If not, let the Timer tick again.

It's not difficult, not really - it's the way you would do it manually!
If you are having problems getting started at all, then this may help: How to Write Code to Solve a Problem, A Beginner's Guide[^]

Richard MacCutchan · Answer 2 · 2021-06-24T23:21:00

Solution 1

I am not sure what your problem is but generating a set of random numbers is fairly simple:

VB

Randomize()
Dim number as Integer
For i As Integer = 1 to 10 ' generate 10 random numbers
    number = Int(Rnd() * 75)
    Console.WriteLine($"number: {number}")
Next

Posted 24-Jun-21 23:21pm

Richard MacCutchan

Comments

Maciej Los 25-Jun-21 5:56am

Richard, seem that OP want to create a lottery system, where there's predefined number of numbers to randomize. He want to get a single number on every button click.

Richard MacCutchan 25-Jun-21 6:02am

Quote: it'll show many random numbers first before showing the last final random number.

Beginner213456 27-Jun-21 21:12pm

i tried the code you gave me and the "&" says character is not valid.
anything i can try?

Richard MacCutchan 28-Jun-21 3:36am

It is not an '&', it is a '$' (dollar sign), which marks the string as interpolated (see $ - string interpolation - C# reference | Microsoft Docs[^]).

As to saving data in a TextBox, you just need to set or add the strings to the Text property of the box. The documentation will show you examples.

Beginner213456 27-Jun-21 21:16pm

also, how to save the randomized number in a textbox after clicking a button.