Ajax简单示例之改变下拉框动态生成表格

            {
                return Request["ProvinceID"];
            }
            else
            {
                return "";
            }
        }
    }
    #endregion

    GetDataSet#region GetDataSet
    private DataSet GetDataSet(string sql)
    {
        string constring=System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
        SqlDataAdapter    sda =new SqlDataAdapter(sql,constring);
        DataSet ds=new DataSet();
        sda.Fill(ds);
        return ds;
    }
    #endregion

    GetCityByProvinceID#region GetCityByProvinceID
    private void GetCityByProvinceID(string ProvinceID)
    {
        string connStr = ConfigurationSettings.AppSettings["ConnectionString"];
        SqlConnection conn = new SqlConnection(connStr);
        string sql = "select * from city where father='" + ProvinceID + "'";
        SqlCommand cmd = new SqlCommand(sql, conn);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();

        string s = @"<table cellspacing='0' cellpadding='4' border='0' id='GridView1' style='color:#333333;border-collapse:collapse;'>";
        s+="<tr style='color:White;background-color:#990000;font-weight:bold;'>";
            s+="<th scope='col'>流水号</th><th scope='col'>代号</th><th scope='col'>城市</th></tr>";
        int m = 0;
        while (dr.Read())
        {
            if (m % 2 == 0)
            {
                s += "<tr style='color:#333333;background-color:#FFFBD6;'>";
            }
            else
            {
                s += "<tr style='color:#333333;background-color:White;'>";
            }
            m++;
            s += "<td>" + dr["id"] + "</td>";
            s += "<td>" + dr["cityID"] + "</td>";
            s += "<td>" + dr["city"] + "</td>";
            s += "</tr>";
        }       
        s+="</table>";
        dr.Close();
        conn.Close();
        this.Response.Write(s);
        this.Response.End();
    }
    #endregion

    ListProvince#region ListProvince
    private void ListProvince()
    {
        string sql = "select * from province";
        DataSet ds = GetDataSet(sql);
        DropDownList1.DataSource = ds;
        DropDownList1.DataTextField = "province";
        DropDownList1.DataValueField = "provinceID";
        DropDownList1.DataBind();

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