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AJAX for Beginners (Part 2) - Using XMLHttpRequest and jQuery AJAX to implement a cascading dropdown

, 14 Jan 2013 CPOL 112.5K 4.7K 110
This article talks about using XMLHttpReqqest and jQuery AJAX in ASP.NET applications.
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
    protected void Page_Load(object sender, EventArgs e)
        if (IsPostBack == false)
            //Let us populate the list of continents in the first drop down
            drpContinent.DataSource = DBHelper.GetContinentList();
            drpContinent.DataTextField = "continentName";
            drpContinent.DataValueField = "continentName";

            //Set the second dropdown as the list of all countries of selected continent
            drpCountry.DataSource = DBHelper.GetCountriesList(drpContinent.SelectedValue);
            drpCountry.DataTextField = "countryName";
            drpCountry.DataValueField = "countryName";

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About the Author

Rahul Rajat Singh
India India
I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.
  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4

If you like my articles, please visit my website for more:[^]

  • Microsoft MVP 2015

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