Webusercontrol simple event Definition

UseWebusercontrolWhen creating a control, the event definition method is as follows:

Controls:

<% @ Control Language = "C #" autoeventwireup = "true" codefile = "supercontrol. ascx. cs" inherits = "supercontrol" %>

<Div>

<Asp: textbox id = "textbox1" runat = "server"> </ASP: textbox>

</Div>

<Div>

<Asp: dropdownlist id = "dropdownlist1" runat = "server" autopostback = "true" ontextchanged = "dropdownlist1_textchanged">

<Asp: listitem> 1 </ASP: listitem>

<Asp: listitem> 2 </ASP: listitem>

<Asp: listitem> 3 </ASP: listitem>

<Asp: listitem> 4 </ASP: listitem>

</ASP: dropdownlist>

</Div>

Background:

 

Public partial class supercontrol: system. Web. UI. usercontrol

{

Public event eventhandler textchanged;//Event Delegate

 

Protected void dropdownlist1_textchanged (Object sender, eventargs E)

{

If (textchanged! = NULL)

{

Textchanged (this, e );

}

}

}

Usage on the page:

<Supercontrol: suppercontrol id = "mycontrol" runat = "server" ontextchanged = "mycontrol_ontextchanged"/>