sdk/samples/all in on code/Visual Studio 2008/CSASPNETCascadingDropDownList/GetDataForCallBack.aspx.cs

   1 /****************************** Module Header ******************************\
   2 * Module Name:  GetDataForCallBack.aspx.cs
   3 * Project:      CSASPNETCascadingDropDown
   4 * Copyright (c) Microsoft Corporation.
   5 *
   6 * This page is used to retrieve data in callback and write data to client.
   7 *
   8 * This source is subject to the Microsoft Public License.
   9 * See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.
  10 * All other rights reserved.
  11 *
  12 * History:
  13 * * 7/24/2009 10:33 AM Thomas Sun Created
  14 \***************************************************************************/
  15
  16 #region Using directives
  17 using System;
  18 using System.Collections;
  19 using System.Configuration;
  20 using System.Data;
  21 using System.Linq;
  22 using System.Web;
  23 using System.Web.Security;
  24 using System.Web.UI;
  25 using System.Web.UI.HtmlControls;
  26 using System.Web.UI.WebControls;
  27 using System.Web.UI.WebControls.WebParts;
  28 using System.Xml.Linq;
  29 using System.Collections.Generic;
  30 using System.Text;
  31 #endregion
  32
  33
  34 namespace CSASPNETCascadingDropDownList
  35 {
  36     public partial class GetDataForCallBack : System.Web.UI.Page
  37     {
  38         /// <summary>
  39         /// Page Load event
  40         /// </summary>
  41         /// <param name="sender"></param>
  42         /// <param name="e"></param>
  43         protected void Page_Load(object sender, EventArgs e)
  44         {
  45             // Get querystring from URL and retrieve data basing on it
  46             if (Request.QueryString.Count > 0)
  47             {
  48                 string strValue = Request.QueryString[0];
  49                 if (Request.QueryString["country"] != null)
  50                 {
  51                     RetrieveRegionByCountry(strValue);
  52                 }
  53                 else
  54                 {
  55                     RetrieveCityByRegion(strValue);
  56                 }
  57             }
  58
  59         }
  60
  61         /// <summary>
  62         /// Get region basing on country value
  63         /// </summary>
  64         /// <param name="strValue">The country value</param>
  65         public void RetrieveRegionByCountry(string strValue)
  66         {
  67             List<string> list = RetrieveDataFromXml.GetRegionByCountry(strValue);
  68             WriteData(list);
  69         }
  70
  71         /// <summary>
  72         /// Get city basing on region value
  73         /// </summary>
  74         /// <param name="strValue">The region value</param>
  75         public void RetrieveCityByRegion(string strValue)
  76         {
  77             List<string> list = RetrieveDataFromXml.GetCityByRegion(strValue);
  78             WriteData(list);
  79         }
  80
  81         /// <summary>
  82         /// Write data to client
  83         /// </summary>
  84         /// <param name="list">The list contains value </param>
  85         public void WriteData(List<string> list)
  86         {
  87             int iCount = list.Count;
  88             StringBuilder builder = new StringBuilder();
  89             if (iCount > 0)
  90             {
  91                 for (int i = 0; i < iCount - 1; i++)
  92                 {
  93                     builder.Append(list[i] + ",");
  94                 }
  95                 builder.Append(list[iCount - 1]);
  96             }
  97
  98             Response.ContentType = "text/xml";
  99             // Write data in string format "###,###,###" to client
 100             Response.Write(builder.ToString());
 101             Response.End();
 102         }
 103     }
 104 }