VB net - how to create array and assign value?

Hi all

It’s been such a long time since i touch vb.net and I am having a problem… it should be a simple one but I am lost.
I want to create a loop string but before that I am trying to learn how to use the string array.

The following code is what I have but there is always error at the line g(1,0)=t
It is not an object instance. How can this be done?

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim g(,) As String
        Dim t As String = "ok"
        g(1, 0) = t
        MsgBox(g(1, 0))
    End Sub