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copied!<p>As another <code>DataBound</code> controls you have to override <code>PerformDataBinding</code> method as follows.</p> <pre><code>protected override void PerformDataBinding() { base.PerformDataBinding(); if (!IsBoundUsingDataSourceID && this.DataSource == null) return; HierarchicalDataSourceView view = this.GetData(string.Empty); if (view != null) { IHierarchicalEnumerable root = view.Select(); } } </code></pre> <p>Whereas your control supports <code>DataSource</code> and <code>HierarchialDataSource</code> control in this case, should check if there is an assigned <code>DataSource</code>, get its <code>DataSourceView</code> to accomplish data binding. It's practicable through <code>GetData</code> method. Then call view's <code>Select</code> method to get the root collection. </p> <p>Afterwards, you have to iterate through root collection that is an object of type <code>IHierarchialEnumerable</code>. It has a simple method called <code>GetHierarchyData</code> that gives an object which is an item of the collection and returns an associated <code>IHierarchyData</code> that describes a node. This methods is there, therefore in most times you don't know the actual type of item. <code>IHierarchyData</code> represents some information about a node and its children.</p> <p>Lastly, you don't need to write a new <code>DataSource</code> control. If you are after creating a custom navigation control, it's better to write a new provider for <code>SiteMapDataSource</code>.</p>

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