Click to Display Hidden Strings in VB 2010

Public Class Form1
    Dim a, b As String

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        a = "cs"
        b = "4U"
        MsgBox("Complete Set is " & a & "Programs" & b)

    End Sub
End Class