คลิก datagrid แล้วโชว์ข้อมูลวันที่ใน Datetimpicker ช่วดูหน่อยครับมันเอออะไร

  d_dateDTPK.Value = .Rows.Item(e.RowIndex).Cells(2).Value.ToString()  'แสดงได้
   d_bookdateDTPK.Value = .Rows.Item(e.RowIndex).Cells(5).Value.ToString()   'แสดงไม่ได้

  Private Sub drugDGV_CellMouseUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellMouseEventArgs) Handles drugDGV.CellMouseUp
        TabControl1.SelectedIndex = 0
        If e.RowIndex <> -1 Then
            With drugDGV
                d_noTextBox.Text = .Rows.Item(e.RowIndex).Cells(1).Value.ToString()
                d_instituteTextBox.Text = .Rows.Item(e.RowIndex).Cells(3).Value.ToString()
                d_bookinTextBox.Text = .Rows.Item(e.RowIndex).Cells(4).Value.ToString()
                d_dateDTPK.Value = .Rows.Item(e.RowIndex).Cells(2).Value.ToString()
                d_bookdateDTPK.Value = .Rows.Item(e.RowIndex).Cells(5).Value.ToString()
            End With
        End If
    End Sub