private DataSet Data()
    {

        DataTable dt = new DataTable();
        dt.Columns.Add("Id", typeof(int));
        dt.Columns.Add("Name", typeof(string));

        dt.Rows.Add(new object[] { 1, "aaaa" });
        dt.Rows.Add(new object[] { 2, "bbbb" });
        dt.Rows.Add(new object[] { 3, "cccc" });
        dt.TableName = "Parent";




DataTable dtc = new DataTable();
        dtc.Columns.Add("Id", typeof(int));
        dtc.Columns.Add("Qul", typeof(string));

        dtc.Rows.Add(new object[] { 1, "aaaa" });
        dtc.Rows.Add(new object[] { 2, "bbbb" });
        dtc.Rows.Add(new object[] { 3, "bbbb" });
        dtc.TableName = "Child";
 
        DataSet ds = new DataSet();
        ds.Tables.Add(dt);
        ds.Tables.Add(dtc);

    }