مشكلة كل ماأعرض الصور يتم عرض الصور التي قبلها دون افراغ listview ماهو السبب

كود :
 Dim imglist As New ImageList

        imglist.Images.Clear()

        ListView1.Items.Clear()

        imglist.ColorDepth = ColorDepth.Depth32Bit

        ListView1.LargeImageList = imglist

        ListView1.LargeImageList.ImageSize = New System.Drawing.Size(200, 200)

        con.Close()

        If con.State = ConnectionState.Closed Then con.Open()

        Dim strsql As String = "SELECT dbo.pictures.Nu_pic, dbo.FilePictures.Num_File, dbo.FilePictures.Num_pic, dbo.pictures.pic,dbo.Files.Num_file  FROM dbo.FilePictures INNER JOIN dbo.Files ON dbo.FilePictures.Num_File = dbo.Files.No_Genfile INNER JOIN  dbo.pictures ON dbo.FilePictures.Num_pic = dbo.pictures.Nu_pic where dbo.Files.Num_file=" & Text_NoFile.Text

        Dim dt_images As New DataTable

        cmd.Connection = con

        cmd.CommandText = strsql

        adp.SelectCommand = cmd

        adp.Fill(ds)

        For Each dr As DataRow In ds.Tables(0).Rows

            Dim imb_buffer = CType(dr("pic"), Byte())

            Dim img_stream As New IO.MemoryStream(imb_buffer, True)

            img_stream.Write(imb_buffer, 0, imb_buffer.Length)

            imglist.Images.Add(dr("Nu_pic").ToString(), New Bitmap(img_stream))

            img_stream.Close()

            Dim lsvparent As New ListViewItem

            'lsvparent.Text = dr("pic").ToString

            lsvparent.ImageKey = dr("Nu_pic").ToString

            ListView1.Items.Add(lsvparent)

            lsvparent.Text = imglist.Images.Count.ToString

        Next

        con.Close()