add into a listbox - "Object reference not set to an instance of an object."

hello

i need to produce a web page that has a button that takes a selected item from "listbox1" and adds it into "listbox2" via a dataset, this application needs to be used by many users at the same time.

this is the code for the button...

PHP Code:

---

    Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
        Dim Tag As DataRow
        Tag(1) = ListBox1.SelectedItem.Text
        dstSelectedTags.Tables("tblSelectedTags").Rows.Add(Tag)
        ListBox2.DataSource = dstSelectedTags
        ListBox2.DataBind()
    End Sub 


---

i am getting "Object reference not set to an instance of an object."

what is wrong??

please help
thanks,
tom

Dim Tag As DataRow

Should have the NEW keyword somewhere.

Dim Tag As New DataRow

Or it could be that the SelectedItem is nothing.