readonly variable?!!!

[Frans C]

You're absolutely right tygur, on both accounts.
I misread the question, and ReadOnly variables act like constants.

There are only a few differences between contants and ReadOnly variables.

Next to initializing the variable inline (Public ReadOnly curX As Integer = 5), you can also give it a value in the classes constructor.

Public ReadOnly curX As Integer
 
    Public Sub New()
        curX = 6
    End Sub
    Public Sub New(ByVal NewX As Integer)
        curX = Newx
    End Sub

ReadOnly variables can be of any type, including reference type variables, where constants can only be Boolean, Byte, Char, Date, Decimal, Double, Integer, Long, Object, Short, Single, String, or the name of an enumeration.