Invalid column name 'StartDate'.

Jeg får følgende fejlmeddelelse:

Invalid column name 'StartDate'.
/indkøbsregnskab/index.asp, line 221

Min kode ser sådan her ud:
Linje 221 er sidste linje!

If Request.Form("WhatWasChosen") = "MonthlyConsumptionChosen" Then
            Dim MonthName, intMonth, Year, StartDate, EndDate, intEndDate
            Dim CostFood, CostDrinks, CostCleaning, EndSum1, EndSum2
            MonthName = Request.Form("Month")
            intMonth = ChangeMonthNameToInteger(MonthName)
            Year = Request.Form("Year")
            StartDate = Year & "-" & intMonth & "-01"
            StartDate = CDate(StartDate)
            intEndDate = CalculateEndDate(MonthName, Year)
            EndDate = Year & "-" & intMonth & "-" & intEndDate
            EndDate = CDate(EndDate)
            Set objConn = Server.Createobject("ADODB.Connection")
            strConnString = "Provider=SQLOLEDB;" & _
                            "Persist Security Info=FALSE;" & _
                            "User ID=sa;" & _
                            "Password=pb16950;" & _
                            "Initial Catalog=Indkøbsregnskab;" & _
                            "Initial File Name = C:\Programmer\Microsoft SQL Server\MSSQL\" & _
                            "DATA\Indkøbsregnskab_Data.mdf;"
            objConn.Open strConnString
            strSQL = "SELECT * FROM Consumption_T WHERE Date_DT > StartDate AND " & _
                    "Date_DT < EndDate ORDER BY Date_DT"
            Set objRS = Server.Createobject("ADODB.Recordset")
            objRS.Open strSQL, objConn, adOpenStatic, adLockReadOnly, AdCmdText

Hvad er der galt?