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    <pre><code>li.Attributes.Add("onselectedindexchanged","selectedIndexChanged"); </code></pre> <p>Adds a client-side HTML attribute. The selectedIndexChanged method you've shown here is a server side method. You either need to add an auto-post-back to your control, and a server-side event handler to the control to make it call your C# function on the server, or make a client-side JavaScript function to handle the client-side event.</p> <p>edit---</p> <p>When the page is posted back to the server, the control ceases to exist. The Page is a new isntance, which hasn't had the listbox added to its controls collection. The event IS being called when auto-postback is true, but the control doesn't exist in the server's Page object, and if you remove the If Page.IsPostBack block, the control is re-created, and so the control is not the one whose event was raised, and that control still doesn't exist.</p> <p>Whats the actual aim of this control? Is it just to provide a master-details thing?</p> <p>edit 2---</p> <p>Created solution for you that works:</p> <p>Page:</p> <pre><code>&lt;asp:ListBox ID="ListBox1" runat="server" AutoPostBack="true" Visible="false" OnSelectedIndexChanged="ListBox1_SelectedIndexChanged"&gt;&lt;/asp:ListBox&gt; &lt;br /&gt; &lt;asp:ListBox ID="ListBox2" runat="server" Visible="false"&gt;&lt;/asp:ListBox&gt; </code></pre> <p>Codebehind:</p> <pre><code>private List&lt;string&gt; myList = new List&lt;string&gt; { "Serkan", "Kadir" }; private List&lt;string&gt; mySecondList = new List&lt;string&gt; { "Istanbul", "Ankara" }; protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { if (myList.Count &gt; 0) { ListBox1.DataSource = myList; ListBox1.DataBind(); ListBox1.Visible = true; } } } protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e) { ListBox2.DataSource = mySecondList; ListBox2.DataBind(); ListBox2.Visible = true; } </code></pre>
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    1. PODynamically added ListBox's EventHandler is not firing on ASP.Net
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    1. COyou are missing whole things. These controls are added manually. Please read my question carefully, controls will be added dynamically (it means there will be N number listbox) and event handlers too. You are adding manually, and changing visibility. Sorry, but this is not my question's answer.
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      1. USSerkan Hekimoglu
    2. COSorry the point I'm trying to make is that the Controls collection belongs to a specific instance of Page. Every time you request a page from the server a new instance is created, i.e. it knows nothing about the controls you added to a previously created instance of the page which now no longer exists.
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    3. COASP.net generates HTML, HTML has no "visibility". The reason I suggested that approach is that it will generate the exact same HTML markup as your method, but will work on post-back. What visible=false does is tell ASP.net not to render any HTML. The important difference is that the control is registered in every instance of the Page/UserControl, and so is valid for use with events etc, where the controls you are adding will not work on post-back because they only exist in a previous instance that no longer exists. BTW your original question doesn't mention variable number of levels.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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