validate start date is not greater then end date

[lillyehrhart]

I have a webpage with some textboxes and drop down lists. I have already validated to make sure that something is selected, now i want to make sure that the start date is not greater than the end date. this is the code i have for that function

Private Function ValidInput() As Boolean
       
        Dim arTextBoxes() As TextBox = {
            tbShipper,
            tbConsignee,
            tbEnterStrtEntDate,
            tbEnterEndShipDate,
            tbEnterStrtShipDate,
            tbEnterEndEntDate,
            tbProNumber,
            tbBillOfLadingNumber,
            tbCheckNumber,
            tbInvoiceNo
        }


        For Each tb In arTextBoxes
            tb.Text = Trim(tb.Text)
            If tb.Text.Length > 0 Then
                Return True
            End If
        Next

       


        'if we made it here, then none of the tbs are filled in.
        If ddlScacs.SelectedIndex <> 0 Then
            Return True
        End If
        If ddlLocation.SelectedIndex <> 0 Then
            Return True
        End If

        If (tbEnterStrtShipDate.Text > tbEnterEndShipDate.Text) Then
           FBErrMess.Visible = True
            FBErrMess.Text = "Start date cannot come after end date."
        End If


        'so at this point, no tbs, no ddls used, yell at them.

        _dbmanager.ClearData()
        RefreshPagers()
        FBErrMess.Text = "Please enter search criteria before searching."
        FBErrMess.Visible = True
        Return False

    End Function

in that function, the start date and end date validation is not working at all. how do i make this work?

[Luk3r]

You should convert your date strings into dates using CDate. Something like this should help.

http://bytes.com/topic/visual-basic/answers/944209-how-subtract-hour-datetime-vb