怎么复制DataTable过滤部分数据到另一个DataTable_ASP.NET

如何复制DataTable过滤部分数据到另一个DataTable
有一个datatable t1 要把 adid列值为 1,3,5,7 的复制到（DataTable）t2 中

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dt.Select()

查查这方法
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dt.Select()

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C# code

 System.Data.DataTable dt = new System.Data.DataTable();            System.Data.DataView dv = new System.Data.DataView(dt);            dv.RowFilter = "adid in(1,2,3,5,7)";            System.Data.DataTable dt2 = dv.ToTable();
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C# code   protected void Page_Load(object sender, EventArgs e)    {        DataTable dt1 = new DataTable();        DataColumn coll = dt1.Columns.Add("id", typeof(Int32));        DataColumn col2 = dt1.Columns.Add("name", typeof(string));        DataRow dr = dt1.NewRow();        dr["id"] = 1;        dr["name"] = "你好";        dt1.Rows.Add(dr);        dr = dt1.NewRow();        dr["id"] = 2;        dr["name"] = "你好";        dt1.Rows.Add(dr);        dr = dt1.NewRow();        dr["id"] = 3;        dr["name"] = "你好";        dt1.Rows.Add(dr);        DataTable dt2 = new DataTable();        DataColumn col3 = dt2.Columns.Add("id", typeof(Int32));        DataColumn col4 = dt2.Columns.Add("name", typeof(string));        for (int i = 0; i < dt1.Rows.Count; i++)        {            if (dt1.Rows[i]["id"].ToString() == "1" || dt1.Rows[i]["id"].ToString() == "3")            {                dt2.ImportRow(dt1.Rows[i]);            }        }        GridView1.DataSource = dt2;        GridView1.DataBind();    }