Ensure excel spreadsheet has data befor insert into SQL

Hello, Im inserting some rows from an excel spreadsheet into a SQL database with the code below. I need to ensure that all fields contain data on the spreadsheet before importing. If there are nulls then do not perform the insert. What would be the simplest way to do this with the code given below?

 Try
            Dim QuoteNumber As String = lblQuoteNumber.Text.Trim
            Dim sSQLTable As String = "BB_ImportQuoteProducts"
            Dim Prclevel As String = ""
            Dim sExcelFileName As String = ("~/ImportProducts/" & lblImportProductsFileName.Text)
            Dim sWorkbook As String = "[Sheet1$]"

            Dim sExcelConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath(sExcelFileName) & ";Extended Properties=""Excel 8.0;HDR=YES;IMEX=1"""
            Dim sSqlConnectionString As String = (System.Configuration.ConfigurationManager.ConnectionStrings("quoteConnectionString").ToString)

            Dim OleDbConn As OleDbConnection = New OleDbConnection(sExcelConnectionString)
            Dim OleDbCmd As OleDbCommand = New OleDbCommand(("SELECT '', '" & QuoteNumber & "','" & Prclevel & "', [PartNumber], [Description], [UOFM], [Quantity], [UOMPrice], [ExtPrice] FROM " & sWorkbook), OleDbConn)

            OleDbConn.Open()

            Dim dr As OleDbDataReader = OleDbCmd.ExecuteReader()
            Dim bulkCopy As SqlBulkCopy = New SqlBulkCopy(sSqlConnectionString)

            bulkCopy.DestinationTableName = sSQLTable
            bulkCopy.WriteToServer(dr)

            OleDbConn.Close()

            lblImported.Text = "Yes"
        Catch ex As Exception
            lblImportProductError.Text = (ex.Message)
        Finally
        End TryStart Free Trial