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[MrAksel]

System.Random is a class that will generate random numbers. It can be used for many different things.
First up, declare a new random, named 'R' or whatever you want it to be.
To declare it, you can use two ways

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Dim R As New System.Random

or

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Dim R As New System.Random(Int32) 'Change Int32 to a number

The first way is just a shortcut for the second way, because it will call the second way with 'Enviroment.TickCount' as the Int32.
To get a random number, use the Next() method:

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Dim RandomNumber As Integer = R.Next() 'No parameters
Dim RandomNumber2 As Integer = R.Next(50) 'The parameter says the MaxValue
Dim RandomNumber3 As Integer = R.Next(10, 50) 'Parameter 1 = MinValue, Parameter 2 = MaxValue

All of these will create a Integer, but there is also a way for getting a Double:

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Dim RandomDouble As Double = R.NextDouble()

That will create a random number between 0.0 and 1.0

The NextBytes method will fill a buffer of bytes with random numbers:

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        Dim r As New Random
        Dim Bytes(9) As Byte '9 is the number of bytes in the array, but its not 9 its 10
        r.NextBytes(Bytes)

Thats the basics, and pretty much everything about the System.Random Class

[Usman55]

This can also be used as a color randomizer but it can also be done by simpler methods. Really nice tutorial, perfectly explained! (+rep)

[MrAksel]

Thanks for the comment