Add rows to between two rosws in gridview

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ASP.NET

private void load()
{
    DataTable table = access.getdatatable("select c.CHECKPOINT_ID,c.CHECKPOINT_NAME , c.SHEDULE_TIME ,c.DISTANCE , c.TYPE_NAME,c.pos_serial, c.enter_date  from check_points c where ROOT_ID='" + TextBox1.Text + "'");
    GridView1.DataSource = table;
    GridView1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
     load();
}

using this code i load my db values to the gridview , now i want add new row to in between these two rows,because sometimes when i adding data some rows can be missed so i want to add those values again so how can i do this ,in asp.net plz help me,..
Thank u
-Chathuranga-