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ListBox usage notes

Source: Internet
Author: User
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<% @ Page Language = "C #" autoeventwireup = "true" codefile = "ListBox. aspx. cs" inherits = "test_listbox" %>

<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
</Head>
<Body>
<Form ID = "form1" runat = "server">
<Div>
<Asp: ListBox id = "listbox1" runat = "server" autopostback = "true" Height = "129px" onselectedindexchanged = "listbox#selectedindexchanged"
Selectionmode = "multiple" width = "103px">
<Asp: listitem> Apple </ASP: listitem>
<Asp: listitem> persimmon </ASP: listitem>
</ASP: ListBox> <br/>
<Br/>
<Asp: textbox id = "textbox1" runat = "server"> </ASP: textbox> <br/>
<Br/>
<Asp: button id = "button1" runat = "server" onclick = "button#click" text = "add"/>
<Br/>
<Asp: Label id = "label1" runat = "server" text = "label"> </ASP: Label> <br/>
<Br/>
<Br/>
====================< Br/>
<Asp: Label id = "label2" runat = "server" text = "Province" width = "26px"> </ASP: Label>
<Asp: dropdownlist id = "dropdownlist1" runat = "server" autopostback = "true" onselectedindexchanged = "dropdownlist1_selectedindexchanged">
</ASP: dropdownlist> <br/>
<Asp: Label id = "label3" runat = "server" text = "city" width = "27px"> </ASP: Label> <asp: dropdownlist
Id = "dropdownlist2" runat = "server">
</ASP: dropdownlist> <br/>
<Br/>
<Br/>
<Br/>
<Br/>
<Br/>
<Br/>
<Br/>
<Br/>

</Div>
</Form>
</Body>
</Html>

========================================================== ====================

Using system;
Using system. Data;
Using system. configuration;
Using system. collections;
Using system. Web;
Using system. Web. Security;
Using system. Web. UI;
Using system. Web. UI. webcontrols;
Using system. Web. UI. webcontrols. webparts;
Using system. Web. UI. htmlcontrols;
Using system. Data. sqlclient;
Public partial class test_listbox: system. Web. UI. Page
{
Protected void page_load (Object sender, eventargs E)
{
If (! This. ispostback)
{
Sqlconnection con = db2.createconnection ();
Con. open ();
Sqlcommand cmd = new sqlcommand ("select * From Province", con );
Sqldatareader SDR = cmd. executereader ();
This. dropdownlist1.datasource = SDR;
This. dropdownlist1.datatextfield = "proname ";
This. dropdownlist1.datavaluefield = "proid ";
This. dropdownlist1.databind ();
SDR. Close ();
// Con. Close ();

Sqlcommand cmdcity = new sqlcommand ("select * from city where proid =" + this. dropdownlist1.selectedvalue. tostring (), con );
SDR = cmdcity. executereader ();
This. dropdownlist2.datasource = SDR;
This. dropdownlist2.datavaluefield = "cityid ";
This. dropdownlist2.datatextfield = "cityname ";
This. dropdownlist2.databind ();
SDR. Close ();

Con. Close ();
}

}
Protected void button#click (Object sender, eventargs E)
{
This. listbox1.items. Add (this. textbox1.text );
}
Protected void listbox1_selectedindexchanged (Object sender, eventargs E)
{
Label1.text = "you have selected:" + this. listbox1.selecteditem. text;
}
Protected void dropdownlistincluselectedindexchanged (Object sender, eventargs E)
{
Sqlconnection con = db2.createconnection ();
Con. open ();
Sqlcommand cmd = new sqlcommand ("select * from city where proid =" + this. dropdownlist1.selectedvalue. tostring (), con );
Sqldatareader SDR = cmd. executereader ();
This. dropdownlist2.datasource = SDR;
This. dropdownlist2.datavaluefield = "cityid ";
This. dropdownlist2.datatextfield = "cityname ";
This. dropdownlist2.databind ();
SDR. Close ();

Con. Close ();
}
}

The following is a link between dropdownlist and ListBox!

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
listbox clear net listbox php listbox wpf listbox listbox methods html input type listbox listbox windows phone

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