ASP.NET

using System;<br />
using System.Web;<br />
using System.Collections;<br />
using System.Collections.Generic;<br />
using System.Web.Services;<br />
using System.Web.Services.Protocols;<br />
using System.Xml.Serialization;<br />
<br />
using System.Collections.Specialized;<br />
using AjaxControlToolkit;<br />
<br />
<br />
/// <summary><br />
/// Summary description for TerritoriesService<br />
/// </summary><br />
[WebService(Namespace = "http://tempuri.org/")]<br />
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]<br />
[System.Web.Script.Services.ScriptService]<br />
public class TerritoriesService : System.Web.Services.WebService<br />
{<br />
<br />
    public TerritoriesService()<br />
    {<br />
<br />
        //Uncomment the following line if using designed components <br />
        //InitializeComponent(); <br />
    }<br />
    <br />
    <br />
    <br />
    [WebMethod]<br />
    public string HelloWorld()<br />
    {<br />
        return "Hello World";<br />
    }<br />
<br />
<br />
    /// <summary><br />
    /// <br />
    /// </summary><br />
    /// <param name="knownCategoryValues"></param><br />
    /// <param name="category"></param><br />
    /// <returns></returns><br />
    [WebMethod]<br />
    public CascadingDropDownNameValue[] GetCountries(string knownCategoryValues, string category)<br />
    {<br />
        UNIVERSAL.CommonBLL.Country.Country oCountry = UNIVERSAL.CommonBLL.Country.CountryFactory.GetInstance();<br />
        UNIVERSAL.CommonBLL.Country.CountryCollection objCountryCollection = (UNIVERSAL.CommonBLL.Country.CountryCollection)oCountry.GetAll();<br />
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();<br />
<br />
        foreach (UNIVERSAL.CommonBLL.Country.Country objCountry in objCountryCollection)<br />
        {<br />
            values.Add(new CascadingDropDownNameValue(objCountry.Name,objCountry.PKID.ToString()));<br />
        }<br />
<br />
        return values.ToArray();<br />
                            <br />
<br />
    }<br />
    <br />
    [WebMethod]<br />
    public CascadingDropDownNameValue[] GetStates(string knownCategoryValues, string Category)<br />
    {<br />
        StringDictionary kv = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);<br />
        int CountryID;<br />
       <br />
        if (!kv.ContainsKey("Country") || !Int32.TryParse(kv["Country"], out CountryID))<br />
        {<br />
           return null;<br />
        }<br />
<br />
        UNIVERSAL.CommonBLL.States.States oState = UNIVERSAL.CommonBLL.States.StatesFactory.GetInstance();<br />
        UNIVERSAL.CommonBLL.States.StatesCollection objStateCollection = (UNIVERSAL.CommonBLL.States.StatesCollection)oState.GetAll(CountryID.ToString());<br />
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();<br />
<br />
        foreach (UNIVERSAL.CommonBLL.States.States objState in objStateCollection)<br />
        {<br />
            values.Add(new CascadingDropDownNameValue(objState.Name, objState.PKID.ToString()));<br />
        }<br />
        return values.ToArray();<br />
    }<br />
}<br />

<asp:ScriptManager ID="ScriptManager1" runat="server">
              <asp:DropDownList ID="ddlCountry" runat="server">
                    </asp:DropDownList></td>
                <td style="width: 100px">
                    <cc1:CascadingDropDown ID="CascadingDropDown1" runat="server" 
                            TargetControlID="ddlCountry" 
                            Category ="Country"
                            PromptText="PleaseSelectCountry" 
                            LoadingText="Please Wait..." 
                            ServiceMethod="GetCountries"
                            ServicePath="TerritoriesService.asmx" />                       
                       
                </td>
            </tr>
            <tr>
                <td style="width: 100px">
                    States</td>
                <td style="width: 100px">
                    <asp:DropDownList ID="ddlStates" runat="server">
                    </asp:DropDownList></td>
                <td style="width: 100px">
                    <cc1:CascadingDropDown ID="CascadingDropDown2" runat="server"
                            Category ="Country"
                            TargetControlID="ddlStates" 
                            ParentControlID="ddlCountry"
                            PromptText="Please Select State" 
                            LoadingText="Please Wait..." 
                            ServiceMethod="GetStates" 
                            ServicePath="TerritoriesService.asmx" />