string strSql = "Select * From tjxw where id='" + Request.QueryString["id"] + "'";
SqlDataAdapter adp = new SqlDataAdapter(strSql, conn);
DataSet ds = new DataSet();
adp.Fill(ds, "tjxw");
Label1.Text = ds.Tables[0].Rows[0]["字段名称"].ToString();
//conn为数据连接对象