pochemu pri navigacii ot odnoj zapisi k drugoj, jesli znachenije CustomerOrderID = is null, v combobox pojavljajentsja ne pustoje znachenije, a prisvaivajetsja 1je iz spiska comboboxa? kak sdelat', chto by otobrazhenije bylo korrektnym?

Dim da1 As SqlClient.SqlDataAdapter = New SqlClient.SqlDataAdapter(cmdString, myConnection)
Dim dataSet2 As DataSet = New DataSet()
da1.Fill(dataSet2, "OurCustomers")

With Me.CustomerID
.DataSource = dataSet2.Tables("OurCustomers")
.ValueMember = "ID"
.DisplayMember = "CompName"

End With

Me.CustomerID.DataBindings.Add("selectedvalue", DsOrdersSql2, "Orders.CustomerOrderID")