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DataTable dt = ds.Tables[0];
        DataView dv = new DataView(dt);
                  if (dv.Count > 0)
            {
                GridView1.DataSource = dv;
                GridView1.DataBind();

            }
            else
            {


                for (int i = dt.Rows.Count - 1; i >= 0; i--)
                    dt.Rows.Remove(dt.Rows[i]);

                dt.Rows.Add(dt.NewRow());
                GridView1.DataSource = dt;
                GridView1.DataBind()


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