Asp.net specifies the characters ,,

Add some functions to the control. (Can only be viewed in IE)

For example, textbox controls ,,,,

Generally, an attribute is added.CheckcodeAnd added textboxOnkeypressEvent, write the script into a sring ,,
Page. clientscript. registerclientscriptblock (this. GetType (), "key1", scriptstring, true );Execute scripts ,,,

Using system;
Using system. Collections. Generic;
Using system. LINQ;
Using system. text;

Using system. Web;
Using system. componentmodel;
Using system. Web. UI;
Using system. Web. UI. webcontrols;

Namespace my_customwebcontrls
{
[Defaultproperty ("text "),
Toolboxdata ("<{0}: mytextbox runat = 'server' text =''> </{0}: mytextbox> ")]

Public class mytextbox: textbox
{
Public mytextbox ()
{
This. Load + = new eventhandler (mytextbox_load );
}

Public String checkcode {Get; set ;}
Void mytextbox_load (Object sender, eventargs E)
{

If (this. Page. clientscript. isclientscriptblockregistered ("key1 ")){
Return;
}

Page. clientscript. registerclientscriptblock (this. GetType (), "key1", scriptstring, true );
This. Attributes. Add ("onkeypress", "Return checkinput ('" + checkcode + "')");
}

String temp = string. empty;
Public String scriptstring {

Get {
Temp + = "function checkinput (CODE ){";
Temp + = "for (VAR I = 0; I <code. length; I ++ ){";
Temp + = "If (code. charcodeat (I) = event. keycode ){";
Temp + = "Return true ;}}";

Temp + = "Return false ;}";
Return temp;
}
}
}
}