vb.net - 添加数据时对象引用未设置为对象的实例

Question

我是新手...我很抱歉...请帮帮我定位数据项...之前搜索是功能，但是当商品已添加到明细表预订时，搜索不是功能（错误）附件错误代码和搜索代码我附在下面..谢谢... .

Private Sub txtCari_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtCari.TextChanged       
    DS.Tables("tbl_barang").DefaultView.RowFilter = " kode_barang LIKE '%" & txtCari.Text & "%' OR nama_barang LIKE '%" & txtCari.Text & "%'or nama_satuan LIKE '%" & txtCari.Text & "%' or nama_spesifikasi LIKE '%" & txtCari.Text & "%'"
End Sub