VB中至少一个对象没有指定值，然后就出现对象关闭时，不允许操作,该怎么解决

VB中至少一个对象没有指定值，然后就出现对象关闭时，不允许操作
Option Explicit
Private strQuery As String
Private fromtime As String '开始时间
Private totime As String '结束时间

Private Sub CmdCancel_Click()
  Unload Me
  Exit Sub
End Sub
Private Sub setstrQuery()
  fromtime = Me.SYear & "-" & Me.SMonth & "-1" & "-" & Me.SDay & "-2"
  totime = Me.EYear & "-" & Me.EMonth & "-1" & "-" & Me.EDay & "-2"
  If Me.IDchecked.Value = vbChecked And Me.Timechecked.Value = vbChecked Then
  strQuery = "select * from 改变信息 where AID='" & Me.StuffID
  strQuery = strQuery & "' and OutTime between #" & fromtime & "# and #"
  strQuery = strQuery & totime & "#"
  MsgBox strQuery
  ElseIf Me.IDchecked.Value = vbChecked Then
  strQuery = "select * from 改变信息 where AID='" & Me.StuffID & "' order by ID"
  ElseIf Me.Timechecked.Value = vbChecked Then
  strQuery = "select * from 改变信息 where OutTime between #" & fromtime
  strQuery = strQuery & "# and #" & totime & "# order by ID"
  Else
  strQuery = "select * from 改变信息 order by ID"
  End If
End Sub

Private Sub CmdOk_Click()
  Call setstrQuery
  TurnInfoRS.Adodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + App.Path + "\员工.mdb"
  TurnInfoRS.Adodc1.RecordSource = strQuery
  If strQuery <> "" Then
  frmAlterationResult.Adodc1.Refresh
  End If
  Set TurnInfoRS.DataGrid1.DataSource = TurnInfoRS.Adodc1.Recordset
  TurnInfoRS.DataGrid1.Refresh
  TurnInfoRS.Show
  TurnInfoRS.ZOrder 0
  Unload Me
End Sub

Private Sub Form_Load()
 Dim i, j As Integer
  Dim SQL As String
  Dim rs As New ADODB.Recordset
  SQL = "select distinct AID from 改变信息 order by AID"
  Set rs = TransactSQL(SQL)
  If rs.EOF = False Then
  rs.MoveFirst
  While Not rs.EOF
  Me.StuffID.AddItem rs(0)
  rs.MoveNext
  Wend
  Me.StuffID.ListIndex = 0
  End If
  rs.Close
  SQL = "select distinct OutTime from 改变信息"
  Set rs = TransactSQL(SQL)
  If Not rs.EOF Then
  rs.MoveFirst
  While Not rs.EOF
  If Not IsNull(rs.Fields(0)) Then '设置年
  Me.SYear.AddItem Left(rs(0), 4)
  Me.EYear.AddItem Left(rs(0), 4)
  End If
  rs.MoveNext
  Wend
  rs.Close
  Me.SYear.ListIndex = 0
  Me.EYear.ListIndex = 0
  End If
  For i = 1 To 12 '设置月
  Me.SMonth.AddItem i
  Me.EMonth.AddItem i
  Next i
  Me.SMonth.ListIndex = 0
  Me.EMonth.ListIndex = 0
   
  For j = 1 To 30 '设置日
  Me.SDay.AddItem j
  Me.EDay.AddItem j
  Next j
  Me.SDay.ListIndex = 0
  Me.EDay.ListIndex = 0
End Sub




还有那个日的设置不会弄，因为有一个月中有30也有31，平年闰年2月份也不同 帮帮忙哦(*^__^*) 嘻嘻……

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