ต้องการ ข้อมูล จาก GridView ที่ 1 มาโชว์ใน GridView ที่ 2 ค่ะ Asp.Net C#

DataTable dt = new DataTable();
DataRow dr;

//*** Column ***//
dt.Columns.Add("CustomerID");
dt.Columns.Add("Name");
dt.Columns.Add("Email");
dt.Columns.Add("CountryCode");
dt.Columns.Add("Budget");
dt.Columns.Add("Used");

//*** Rows ***//
dr = dt.NewRow();
dr["CustomerID"] = "C001";
dr["Name"] = "Win Weerachai";
dr["Email"] = "[email protected]";
dr["CountryCode"] = "TH";
dr["Budget"] = "1000000";
dr["Used"] = "600000";
dt.Rows.Add(dr);

//*** Rows ***//
dr = dt.NewRow();
dr["CustomerID"] = "C002";
dr["Name"] = "John Smith";
dr["Email"] = "[email protected]";
dr["CountryCode"] = "EN";
dr["Budget"] = "2000000";
dr["Used"] = "800000";
dt.Rows.Add(dr);


//  dt; //*** Use DataTable ***//

private DataRow tmp_drTest;
private DataTable tmp_dttTest;
private DataTable aGetTest()
{
        tmp_dttTest = new DataTable();

        DataColumn tmp_dtc0 = new DataColumn("name", typeof(string));
        DataColumn tmp_dtc1 = new DataColumn("price", typeof(string));

        tmp_dttTest.Columns.Add(tmp_dtc0);
        tmp_dttTest.Columns.Add(tmp_dtc1);

        DataRow tmp_dtr;

        tmp_dtr = tmp_dttTest.NewRow();

        return tmp_dttTest;
}

aGetTest(); //เรียก DataTable ที่สร้างไว้ครับ

int rowcount = GridView1.Rows.Count;
string old = "";
int oldsum = 0;
int oldIndex = 0;

        for (int i = 0; i < rowcount; i++)
        {
            GridViewRow gr = GridView1.Rows[i];

            Label lblName = (Label)gr.FindControl("lblName"); 
            Label lblPrice = (Label)gr.FindControl("lblPrice");

            if (lblName.Text.Trim() != old)
            {
                tmp_drTest = tmp_dttTest.NewRow();

                tmp_drTest["name"] = lblName.Text;
                tmp_drTest["price"] = lblPrice.Text;

                tmp_dttTest.Rows.Add(tmp_drTest);

                oldsum = Convert.ToInt32(lblPrice.Text);
                oldIndex = i;
            }
            else if (lblName.Text.Trim() == old)
            {
                oldsum = Convert.ToInt32(lblPrice.Text) + oldsum;

                tmp_dttTest.Rows[oldIndex].BeginEdit();
                tmp_dttTest.Rows[oldIndex]["price"] = oldsum;
                tmp_dttTest.Rows[oldIndex].EndEdit();
                tmp_dttTest.Rows[oldIndex].AcceptChanges();
            }

            old = lblName.Text.Trim();
        }

        GridView2.DataSource = tmp_dttTest;
        GridView2.DataBind();