[SQL SQVER VB.NET] อยากสอบถามผู้รู้สักนิดนะครับ ......

        Dim Sql_x As String
        Sql_x = ""

        Sql_x = "SELECT tbl_promotion.id_po_list,"

        Sql_x = Sql_x & ",'#',Last_day+'/'+last_month +'/' + last_year +'#' AS LastDate "

        Sql_x = Sql_x & "FROM  tbl_promotion 

        Sql_x = Sql_x & "WHERE  LastDate > '#" & Today.Day.ToString & "/" & Today.Month.ToString & "/" & Today.Year.ToString & "#' ;"
       
        Dim DAX As New SqlDataAdapter
        Dim DCX As New SqlCommand
        Dim DSX As New DataSet
        DCX.Connection = Open_connec_Sarver()
        DCX.CommandText = Sql_x
        DAX.SelectCommand = DCX
        DAX.Fill(DSX, "DRX") <<================ Error ตรงนี้ครับ มันบอกหา  LastDate  ไม่เจอ