Web/Controls/CascadeListControl.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Collections.Specialized;


namespace ComLib.Web.UI.Controls
{
    /// <summary>
    /// This class implements a cascaded drop down list control.
    /// </summary>
    [DefaultProperty("Text"), ToolboxData("<{0}:CascadeListControl runat=\"server\"> </{0}:CascadeListControl>")]
    public class CascadeDropDownListControl : WebControl, INamingContainer, IPostBackDataHandler
    {
        private HtmlSelect _lstCascade;
        private string _selectedValue;


        /// <summary>
        /// Flag to indicate if this client side object's data
        /// will be initiated / loaded from url ajax page.
        /// </summary>
        [Category("Behavior"), DefaultValue(""),
        Description("Specifies whether the control needs to initialize to restore state.")]
        public bool NeedsInitialization
        {
            get { return GetViewStateBoolItem("NeedsInitialization"); }
            set { ViewState["NeedsInitialization"] = value; }
        }


        /// <summary>
        /// Flag to indicate if this client side object's data
        /// will be initiated / loaded from url ajax page.
        /// </summary>
        [Category("Behavior"), DefaultValue(""),
        Description("Specifies whether the control needs to initialize to restore state.")]
        public bool AddCustomInitialItem
        {
            get { return GetViewStateBoolItem("AddInitialItem"); }            
            set { ViewState["AddInitialItem"] = value; }