ambiguousmatchexception was unhandled

[bettybarnes]

Overload resolution failed because no Public 'Add' can be called with these arguments: 'Public Function Add(text As String) As System.Windows.Forms.ListViewItem.ListViewSubItem': Argument matching parameter 'text' cannot convert from 'DBNull' to 'String'. 'Public Function Add(item As System.Windows.Forms.ListViewItem.ListViewSubItem) As System.Windows.Forms.ListViewItem.ListViewSubItem': Argument matching parameter 'item' cannot convert from 'DBNull' to 'ListViewSubItem'.

this is my error message pls help me

Public Sub displaydata()
        Dim objdatareader As SqlDataReader
        Dim strsql As String = "ViewAllContacts"
        objdatareader = objcommand.ExecuteReader
        While objdatareader.Read
            Dim listview As New ListViewItem
            With listview
                .Text = objdatareader.Item("ContactID")
                .SubItems.Add(objdatareader("Lname"))
                .SubItems.Add(objdatareader("Fname"))
                .SubItems.Add(objdatareader("Mname"))
                .SubItems.Add(objdatareader("Address"))
                .SubItems.Add(objdatareader("ContactNum"))
                .SubItems.Add(objdatareader("EmailAdd"))
                .SubItems.Add(objdatareader("DOB"))
            End With
            ListView1.Items.Add(listview)
        End While
    End Sub