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

, 14 Jan 2013
This article talks about using XMLHttpReqqest and jQuery AJAX in ASP.NET applications.
AJAXTestWebSite.zip
AJAXTestWebSite
App_Code
App_Data
countriesDb.mdf
countriesDb_log.LDF
JS
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;
using System.Collections;
using System.Data.SqlClient;

/// <summary>
/// Summary description for DBHelper
/// </summary>
public class DBHelper
{   
    public static DataTable GetContinentList()
    {
        DataTable result = null;

        try
        {
            using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
            {
                using (SqlCommand cmd = con.CreateCommand())
                {
                    cmd.CommandType = CommandType.Text;
                    cmd.CommandText = "select distinct continentName from Countries";

                    using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                    {
                        result = new DataTable();
                        da.Fill(result);
                    }
                }
            }
        }
        catch (Exception)
        {
            //Pokemon exception handling
        }
        return result;
    }

    public static DataTable GetCountriesList(string continentNmame)
    {
        DataTable result = null;
        
        try
        {
            using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
            {
                using (SqlCommand cmd = con.CreateCommand())
                {
                    cmd.CommandType = CommandType.Text;
                    cmd.CommandText = "select countryName from Countries where continentName = @continent";
                    cmd.Parameters.Add(new SqlParameter("@continent", continentNmame));

                    using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                    {
                        result = new DataTable();
                        da.Fill(result);
                    }
                }
            }
        }
        catch (Exception)
        {
            //Pokemon exception handling
        }
        return result;
    }
}


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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Rahul Rajat Singh
Software Developer (Senior)
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): Windows Communication Foundation Development with Microsoft .NET Framework 4
 
If you like my articles, please visit my website for more: www.rahulrajatsingh.com[^]
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