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DataSet ds = new DataSet();
SqlConnection conn = new SqlConnection("server=localhost;uid=sa;pwd=20070206;database=mypublic");
conn.Open();
String sql = "select e_nid,e_test from myexercise order by e_nid desc";
SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
adapter.Fill(ds);
this.GridView1.DataSource = ds.Tables[0].DefaultView;
this.GridView1.DataBind();
//该句用来生成xml文件
ds.WriteXml(Server.MapPath("aa.xml"), XmlWriteMode.IgnoreSchema);