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Posted 19 Sep 2002

ASP.NET Page Templates - Using Inheritance

, 19 Sep 2002
A tutorial showing how to create page templates that use object-oriented inheritance.
using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;

namespace PageInheritanceSample
	/// <summary>
	/// Summary description for AdvancedPageInheritanceBase.
	/// </summary>
	public class AdvancedPageInheritanceBase : PageBase
		protected TextBox searchBox;

		protected override void OnInit(System.EventArgs e)
			BuildPage( GenerateHtmlForm() );

		protected virtual void BuildPage( HtmlForm form )
			// Build the page and include the generated form

			this.Controls.AddAt( 0, new LiteralControl( @"
				<!DOCTYPE HTML PUBLIC '-//W3C//DTD HTML 4.0 Transitional//EN'>
						<title>" + PageTitle + @"</title>
						<table bgcolor='silver' width='100%'>
							<td colspan=2><h1>Our Page Header</h1></td>
									<li><a href='Page1.aspx'>Page 1</a></li>
									<li><a href='Page2.aspx'>Page 2</a></li>
							<td bgcolor='white'>
				") );

			this.Controls.Add( form );

			this.Controls.Add( new LiteralControl( @"
							<td colspan=2><small>This is our footer</small></td>

		protected virtual HtmlForm GenerateHtmlForm()
			HtmlForm form = new HtmlForm();
			return form;

		protected void AddSearch( HtmlForm form )
			searchBox = new TextBox();
			Button searchButton = new Button();
			searchButton.Text = "Search";
			searchButton.Click += new EventHandler( this.OnSearchButtonClicked );
			form.Controls.Add( searchBox );
			form.Controls.Add( searchButton );
			form.Controls.Add( new LiteralControl("<br>") );

		protected void OnSearchButtonClicked( object sender, EventArgs e )
			string searchText = searchBox.Text;

		protected virtual void AddControlsFromDerivedPage(HtmlForm form)
			int count = this.Controls.Count;
			for( int i = 0; i<count; ++i )
				System.Web.UI.Control ctrl  = this.Controls[0];
				form.Controls.Add( ctrl );
				this.Controls.Remove( ctrl );

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About the Author

Peter Provost
Web Developer
United States United States
Peter Provost has been programming computers since he was 10 years old. Currently a C# and C++ junkie, he has been developing on the Windows platform since Windows 286.

Peter is a Software Design Engineer with Microsoft's patterns and practices team where he works on guidance for .NET developers.

Peter maintains an active weblog about technology, .NET and other interesting stuff at

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