How to update Update record in a dataview [Resolved]

Hi,
I want to update a record in my dataview. But it is not working. The code is...

string connstr = "Data Source=ARKA-PC;Initial Catalog=rgdb;User Id = sa;password = 12345";

            SqlConnection conn = new SqlConnection(connstr);
            SqlCommand cmd;
            SqlDataAdapter sda = new SqlDataAdapter();
            DataSet ds = new DataSet();
            DataView dv;

            try
            {
                conn.Open();
                cmd = new SqlCommand("select * from reg_table", conn);
                sda.SelectCommand = cmd;
                sda.Fill(ds, "reg_table");
                sda.Dispose();
                cmd.Dispose();
                conn.Close();

                dv = new DataView(ds.Tables[0], "", "country", DataViewRowState.CurrentRows);

                int index = dv.Find("'yemen'");

                if (index == -1)
                {
                    Response.Write("country not found");
                }
                else
                {
                    dv[index]["country"] = "germany";
                    Response.Write("country Updated !");
                } 

                GridView1.DataSource = dv;
                GridView1.DataBind();
            }
            catch (Exception ex)
            {
                Response.Write(ex.ToString());
            }

Can anybody help ??

Thanks
Akiii

[Resolved]