Some Learning Experiences on composite controls in Asp.net

In. NET 2.0, system. Web. UI. webcontrols. compositecontrol makes the composite control easier to use.
In the past, the most common code for composite controls was public class labeltextbox: webcontrol, inamingcontainer.
{
Public String text {
Get {
Object o = viewstate ["text"];
If (O = NULL)
Return string. empty;
Return (string) O;
}
Set {viewstate ["text"] = value ;}
}
Public String title {
Get {
Object o = viewstate ["title"];
If (O = NULL)
Return string. empty;
Return (string) O;
}
Set {viewstate ["title"] = value ;}
}
Protected override void createchildcontrols ()
{
Controls. Clear ();
Createcontrolhierarchy ();
Clearchildviewstate ();
}
Protected virtual void createcontrolhierarchy ()
{
Textbox T = new Textbox ();
Label L = new label ();
T. Text = text;
L. Text = title;
Controls. Add (L );
Controls. Add (t );
}
}

The point is that this public class labeltextbox: webcontrol, inamingcontainer
Inherits the webcontrol class and implements the imamingcontainer interface.
However, this composite control design interface is unfriendly during use. In 2.0, a system. Web. UI. webcontrols. compositecontrol is added.
In this way, there will be no design obstacles when the control is applied. The Code is as follows: using system;
Using system. Collections. Generic;
Using system. componentmodel;
Using system. text;
Using system. Web;
Using system. Web. UI;
Using system. Web. UI. webcontrols;

Namespace compositecontrol
{
[Defaultproperty ("text")]
[Toolboxdata ("<{0}: labeltextbox runat = Server> </{0}: labeltextbox>")]
Public class labeltextbox: system. Web. UI. webcontrols. compositecontrol
{
Public String text
{
Get
{
Object o = viewstate ["text"];
If (O = NULL)
Return string. empty;
Return (string) O;
}
Set
{
Viewstate ["text"] = value;
}

}
Public String title11
{
Get
{
Object o = viewstate ["title"];
If (O = NULL)
Return string. empty;
Return (string) O;
}
Set
{
Viewstate ["title"] = value;
}
}

Protected override void createchildcontrols ()
{
Controls. Clear ();
Createcontrolhierarchy ();
Clearchildviewstate ();
}
Protected virtual void createcontrolhierarchy ()
{
Textbox T = new Textbox ();
Label L = new label ();
T. Text = text;
L. Text = title11;
Controls. Add (L );
Controls. Add (t );
}

}
}

This is the case. You can try it.