if you want to generate random strings in array with n length and specified characters than you can use this code:

suppose i want to generate 10 strings in array that contains charecters among (A,B,C,D,E) with length 3.


Dim chars As String() = {"A", "B", "C", "D", "E", "F"}
Dim tempRandom As New Random
Dim RandomStrings(10) As String
For i As Integer = 0 To 10
RandomStrings(i) = chars(tempRandom.Next(0, 5)) & chars(tempRandom.Next(0, 5)) & chars(tempRandom.Next(0, 5))
Next