-1??

Protected Sub addCrewFormAssignment(Optional sfarFk As Integer = 0)
    'validate the data
    Dim crewId = crewAssDrop.SelectedValue
    Dim custId = customerInput.SelectedValue

    If (custId = String.Empty) Then

    End If

    If (crewId = "-1") Then
      success.Text = "<span class='errorClass'>Please select a crew member to add it to.</span>"
      success.Show()
      Exit Sub
    End If

    If (assToDrop.SelectedValue = "1") Then

      If Not IsDate(crewDateInput.SelectedDate) Then
        success.Text = "<span class='errorClass'>Please select a start date.</span>"
        success.Show()
        Exit Sub
      End If
    ElseIf (assToDrop.SelectedValue = "4") Then
      If Not IsDate(dotStartInput.SelectedDate) Then
        success.Text = "<span class='errorClass'>Please select a start date.</span>"
        success.Show()
        Exit Sub
      End If
    End If