== Developing Components in .NET ==

 * Create Assembly/DLL which will contain components.  
   * Add New Project to current Solution as Class Library. Go to File > New > Project, or in Solution Explorer:
     * Select Solution, right-click Add > New Project.
     * Select "Class Library" from Templates (Project Types: Visual C# > Windows > Class Library).
 * Create a Component.
   * Add Component to current Class Library project. Go to Project > Add Component..., or in Solution Explorer:
     * Select class library, then right-click, Add > Component.
 * Modify the Component code. Eg: <code csharp>
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Text;

namespace libCustomApp
{
    public partial class AppCustomizationConfig : Component
    {
        //-----------------------------------------------------
        // Fields
        //-----------------------------------------------------
        private string m_About = "Customization component for applications";
        private string m_Company = "ACME, Inc.";
        private string m_Copyright = "Copyright © 2009, ACME";
        private string m_Website = "http://www.acme.com";
        private string m_Software = "Sample Software";
        private string m_Custom = "My Software";
        private string m_CCny = "001";
        private string m_Mutex = "CompanySoftwareMutex";

        //-----------------------------------------------------
        // Properties
        //-----------------------------------------------------
        public string About
        {
            get { return m_About; }
            set { m_About = value; }
        }
        public string Company
        {
            get { return m_Company; }
            set { m_Company = value; }
        }

        //-----------------------------------------------------
        // Methods
        //-----------------------------------------------------
        public AppCustomizationConfig()
        {
            InitializeComponent();
        }

        public AppCustomizationConfig(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
        }
    }
}

</code>

=== Reference Material ==
 * [[http://msdn.microsoft.com/en-us/library/fc77hxyh.aspx|Walkthrough: Authoring a Component with Visual C#]]
 * [[http://msdn.microsoft.com/en-us/library/a8y82386.aspx|Component Designer]]
 * [[http://support.microsoft.com/kb/837908|How To Load Assembly at Run-time, i.e. Late Binding]]

=== Component Hierarchy ===

<code csharp>
System.Object
  System.MarshalByRefObject
    System.ComponentModel.Component
      System.Windows.Forms.Control
        System.Windows.Forms.ScrollableControl
          System.Windows.Forms.ContainerControl
            System.Windows.Forms.UserControl

</code>
Source: Creating Custom .NET Controls in C#, [[http://www.ondotnet.com/pub/a/dotnet/2002/03/18/customcontrols.html?page=1]], O'Reilly Windows Dev Center.