How to validation checking of a combox?

i want to validation of a combobox field    ...... my error is when i use try catch
error'public member value in type 'icombox' not found.   and with out checking value is added
please solve yhis issue?
Private Sub SBO_Application_ItemEvent(ByVal FormUID As String, ByRef pVal As SAPbouiCOM.ItemEvent, ByRef BubbleEvent As Boolean) Handles SBO_Application.ItemEvent
        Dim oForm As SAPbouiCOM.Form
        oForm = SBO_Application.Forms.Item(FormUID)
        ' Select Case pVal.EventType
        ' Case "SM_VLDFM"
        ' Case SAPbouiCOM.BoEventTypes.et_CLICK
        If pVal.FormUID = "SM_VLDFM" And pVal.ItemUID = "1" And pVal.BeforeAction = True And pVal.EventType = SAPbouiCOM.BoEventTypes.et_ITEM_PRESSED Then
            If oForm.Mode = SAPbouiCOM.BoFormMode.fm_ADD_MODE Or oForm.Mode = SAPbouiCOM.BoFormMode.fm_UPDATE_MODE Then
                oComboBox = oForm.Items.Item("OrVal").Specific()
                If oComboBox.value = "" Then
                    SBO_Application.StatusBar.SetText("Enter The Order No ", SAPbouiCOM.BoMessageTime.bmt_Long, SAPbouiCOM.BoStatusBarMessageType.smt_Error)
                    oForm.Items.Item("OrVal").Click(SAPbouiCOM.BoCellClickType.ct_Regular)
                    BubbleEvent = False
                    ' Exit Sub
                End If
            End If
        End If
end sub

plz help me..........
Edited by: Animesh Sinha on Feb 3, 2009 12:45 PM

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