我做了2个form，第一个form有一个lvzonglan（listview），从access取数列表，然后通过双击获得该行数据弹出到第二个frmMainuser（from）来展现，现在的问题是：比如说我第一次点击的ddid为1，frmMainuser能正常显示，但是关闭frmMainuser后，再次点击listview中其他项，结果显示的还是第一次的那个，请看代码：

'双击事件
 Private Sub lvZonglan_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles lvZonglan.DoubleClick
        Dim ddid As String
        For Each sItem As ListViewItem In lvZonglan.SelectedItems
            ddid = sItem.Text
            MessageBox.Show(ddid.ToString)
        Next
                With frmMainuser
                    .State = gModule.FormState.adStateEditMode
                    .MainuserID = ddid
                    .ShowDialog()
                    Call FillList()
                End With
    End Sub


'显示
Private Sub frmMainuser_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim cnMainuser As OleDbConnection
        cnMainuser = New OleDbConnection
        'MessageBox.Show("Mainuser窗体位置1：" & MainuserID)
        Try
            With cnMainuser
                If .State = ConnectionState.Open Then .Close()

                .ConnectionString = cnString
                .Open()
            End With
        Catch ex As OleDbException
            MsgBox(ex.ToString)
        End Try
        ElseIf State = gModule.FormState.adStateEditMode Then
           Dim qryCustomers As String = "SELECT * FROM ddlistinfo WHERE ddid = '" & MainuserID & "'"           
            daMainuser.SelectCommand = New OleDbCommand(qryCustomers, cnMainuser)
            Dim cb As OleDbCommandBuilder = New OleDbCommandBuilder(daMainuser)           
            daMainuser.Fill(dsMainuser, "ddid")         
            Dim dt As DataTable = dsMainuser.Tables("ddid")         
            Try
                lblDdid.Text = dt.Rows(0)("Ddid")
                lbltype.Text = dt.Rows(0)("Type")
                lblCycle.Text = IIf(IsDBNull(dt.Rows(0)("Cycle")), "", dt.Rows(0)("Cycle")) & " 天"
                lblJhrq.Text = IIf(IsDBNull(dt.Rows(0)("Jhrq")), "", dt.Rows(0)("Jhrq"))
                lblGwsj.Text = IIf(IsDBNull(dt.Rows(0)("Gwsj")), "", dt.Rows(0)("Gwsj")) & " 小时"
                lblState.Text = IIf(IsDBNull(dt.Rows(0)("State")), "", dt.Rows(0)("State"))
                lblfixer.Text = IIf(IsDBNull(dt.Rows(0)("Fixer")), "", dt.Rows(0)("Fixer"))
                lblYnqa.Text = IIf(IsDBNull(dt.Rows(0)("Ynqa")), "", dt.Rows(0)("Ynqa"))
                lblintime.Text = IIf(IsDBNull(dt.Rows(0)("intime")), "", dt.Rows(0)("intime"))
                If lblState.Text = "QA完成" Or lblYnqa.Text = "否" Then
                    btnUdone.Enabled = True
                Else
                    btnUdone.Enabled = False
                End If
            Catch ex As OleDbException
                MsgBox(ex.ToString)
            Finally
                cnMainuser.Close()
            End Try
        End If
    End Sub

请问 这是为什么呢？