What's wrong

[richardMorris.vb]

i have this code to make a simple encryption in vb.2008
it should take a letter and change it/swap it for another for example "A"="B"
and so on and so forth,
i have a basic understanding of vb but not much and i have a vague idea of what i need to do but the code just doesnt seem to work and everything i try just doesnt work, i have used the "Replace" and "insert" methods
but they are not what i am looking for

Dim X(3) As Char

For i = 0 To 3
X(i) = ChrW(100)

Next i
Console.WriteLine(X[0]&X[1]&X[2]&X[3])

End Function

End Class

The X would be 25 because of the alphabet 
Hope you can help

Rich.vb