Random string generator based on format/rules?

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Hey guys, for my VB course in college I have to make an application that can output random characters based on certain rules. I've been taking VB for about a semester now, and I'm familiar with most of the basics (If...Then...Else, For...Next, Select Case, Function, Sub, etc.) but this is the first assignment I've come to that I'm having trouble with.

Basically I made a simple GUI with a button and a read-only textbox. Basically, all I want to do is add the code I need to the button's event handler to make it output a random string in the textbox.

However, for extra marks I'm trying to make it so that the random string will output according to a format I specify.

For example, what would I need to do (or what code would I need) to make it so that when a user clicks the button it will output the string in the a format such as:
number, letter, number, letter, number

So, when they click the button, the textbox will display:
5B3Q9

And have it so that each time the user clicks the button, the numbers and letters are random and different?

Thanks a lot!

[Hack]

Welcome to DevX

We won't write the code for you, but we will help you write the code for yourself.

What do you have so far that isn't working?

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Well, right now all I have so far is an If statement that says if a checkbox is selected (.Checked = True), then outputTextBox.Text = "5B3Q9"
See I thought maybe I could just make it to randomly pick a string out of a list when clicked, but I realize now that wouldn't be very efficient.

The reason I'm here is because I really have no idea where to start as far as randomizing a string selection for an output textbox =/

[Hack]

Randomly pick a string out of what list?

Where/what is the list you have the contains existing strings that you would like to randomly choose from?

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Well, I don't actually have one. But I figured there might be a way to just type a list of possible "random" strings that it could output and then it when the user clicked the button it would just select one and display it. But that's not exactly the same, and I don't know how I would go about doing that either.

[blobyblobyblob]

Use the "Rnd" code thing to generate a random number from 0 to 1.
You can then use that (Like this, "Text1.text = int(rnd * 10)") Which will create a number from 0 to 9.
Int(Rnd * 26 + 1) creates a number from 1 to 26. *HintCoughAlphabet*

[blobyblobyblob]

Also, I forgot to add, you should make a timer that has an interval of 1 and make the code inside of it just say Rnd. Even though VB says it is a random number, it is from a list that is always the same. This way it will accually be random.

[blobyblobyblob]

Create a form with a textbox named "Text1", a timer named "Timer1", and a command button named "Command1". The open up the code window and delete all of the stuff inside and paste in this code:

Dim A As Variant

Private Sub Command1_Click()
Text1.Text = Int(Rnd * 10)
A = Int(Rnd * 26 + 1)
Letter A
Text1.Text = Text1.Text + A
Text1.Text = Text1.Text + Trim(Str(Int(Rnd * 10)))
A = Int(Rnd * 26 + 1)
Letter A
Text1.Text = Text1.Text + A
Text1.Text = Text1.Text + Trim(Str(Int(Rnd * 10)))
End Sub

Public Sub Letter(A As Variant)
If A = 1 Then A = "A"
If A = 2 Then A = "B"
If A = 3 Then A = "C"
If A = 4 Then A = "D"
If A = 5 Then A = "E"
If A = 6 Then A = "F"
If A = 7 Then A = "G"
If A = 8 Then A = "H"
If A = 9 Then A = "I"
If A = 10 Then A = "J"
If A = 11 Then A = "K"
If A = 12 Then A = "L"
If A = 13 Then A = "M"
If A = 14 Then A = "N"
If A = 15 Then A = "O"
If A = 16 Then A = "P"
If A = 17 Then A = "Q"
If A = 18 Then A = "R"
If A = 19 Then A = "S"
If A = 20 Then A = "T"
If A = 21 Then A = "U"
If A = 22 Then A = "V"
If A = 23 Then A = "W"
If A = 24 Then A = "X"
If A = 25 Then A = "Y"
If A = 26 Then A = "Z"
End Sub

Private Sub Timer1_Timer()
Rnd
End Sub