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inheriting from a datalist

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Dave Hickey

Hello -

It seems to me, I read somewhere that you can inherit and customize an asp control, such as a datagrid, to add functionality, etc.

I would like to extend the asp:dropdownlist control, because I just want to add some common database code to it. Is there a way to do this?

When I try to
Inherits System.Web.UI.WebControls.DropDownList

it gives me an error saying that the control has to inherit from UserClass instead.

Any suggestions?

-Dave

Reply to this message...

Paul D. Murphy

This is a control I put together last night written in C# that inherits
from the DropDownList. VB should work the same way.
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Paul
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using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
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namespace Dots.WebControls
{
/// <summary>
/// This drop down list displays a list of United States
states & Canadian Provinces
/// using the common two letter abbrievation for the value
of the state option.
/// </summary>
[DefaultProperty("Text"),=20
ToolboxData("<{0}:USCanadaDropDownList
runat=3Dserver></{0}:USCanadaDropDownList>")]
public class USCanadaDropDownList :
System.Web.UI.WebControls.DropDownList
{
[
Browsable(false)
]
public override
System.Web.UI.WebControls.ListItemCollection Items
{
get
{
// Create a new
list item
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System.Web.UI.WebControls.ListItemCollection returnCollection =3D
new
System.Web.UI.WebControls.ListItemCollection();
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// Add the
states
returnCollection.Add(new
ListItem("Choose a State", ""));
returnCollection.Add(new
ListItem("Outside US/ Canada", "UNK"));
returnCollection.Add(new
ListItem("Alabama", "AL"));
returnCollection.Add(new
ListItem("Alaska", "AK"));
returnCollection.Add(new
ListItem("Alberta", "AB"));
returnCollection.Add(new
ListItem("American Samoa", "AS"));
returnCollection.Add(new
ListItem("Arizona", "AZ"));
returnCollection.Add(new
ListItem("Arkansas", "AR"));
returnCollection.Add(new
ListItem("Armed Forces America", "AA"));
returnCollection.Add(new
ListItem("Armed Forces Europe", "AE"));
returnCollection.Add(new
ListItem("Armed Forces Pacific", "AP"));
returnCollection.Add(new
ListItem("British Columbia", "BC"));
returnCollection.Add(new
ListItem("California", "CA"));
returnCollection.Add(new
ListItem("Colorada", "CO"));
returnCollection.Add(new
ListItem("Connecticut", "CT"));
returnCollection.Add(new
ListItem("Delaware", "DE"));
returnCollection.Add(new
ListItem("District Of Columbia", "DC"));
returnCollection.Add(new
ListItem("Florida", "FL"));
returnCollection.Add(new
ListItem("Georgia", "GA"));
returnCollection.Add(new
ListItem("Guam", "GU"));
returnCollection.Add(new
ListItem("Hawaii", "HI"));
returnCollection.Add(new
ListItem("Idaho", "ID"));
returnCollection.Add(new
ListItem("Illinois", "IL"));
returnCollection.Add(new
ListItem("Indiana", "IN"));
returnCollection.Add(new
ListItem("Iowa", "IA"));
returnCollection.Add(new
ListItem("Kansas", "KS"));
returnCollection.Add(new
ListItem("Kentucky", "KY"));
returnCollection.Add(new
ListItem("Louisiana", "LA"));
returnCollection.Add(new
ListItem("Maine", "ME"));
returnCollection.Add(new
ListItem("Manitoba", "MB"));
returnCollection.Add(new
ListItem("Maryland", "MD"));
returnCollection.Add(new
ListItem("Massachusetts", "MA"));
returnCollection.Add(new
ListItem("Michigan", "MI"));
returnCollection.Add(new
ListItem("Minnesota", "MN"));
returnCollection.Add(new
ListItem("Mississippi", "MS"));
returnCollection.Add(new
ListItem("Missouri", "MO"));
returnCollection.Add(new
ListItem("Montana", "MT"));
returnCollection.Add(new
ListItem("Nebraska", "NE"));
returnCollection.Add(new
ListItem("Nevada", "NV"));
returnCollection.Add(new
ListItem("New Brunswick", "NB"));
returnCollection.Add(new
ListItem("New Hampshire", "NH"));
returnCollection.Add(new
ListItem("New Jersey", "NJ"));
returnCollection.Add(new
ListItem("New Mexico", "NM"));
returnCollection.Add(new
ListItem("New York", "NY"));
returnCollection.Add(new
ListItem("Newfoundland", "NF"));
returnCollection.Add(new
ListItem("North Carolina", "NC"));
returnCollection.Add(new
ListItem("North Dakota", "ND")); =20
returnCollection.Add(new
ListItem("Northwest Territories", "NT"));
returnCollection.Add(new
ListItem("Nova Scotia", "NS"));
returnCollection.Add(new
ListItem("Ohio", "OH"));
returnCollection.Add(new
ListItem("Oklahoma", "OK"));
returnCollection.Add(new
ListItem("Ontario", "ON"));
returnCollection.Add(new
ListItem("Oregon", "OR"));
returnCollection.Add(new
ListItem("Palau", "PW"));
returnCollection.Add(new
ListItem("Pennsylvania", "PA"));
returnCollection.Add(new
ListItem("Prince Edward Island", "PE"));
returnCollection.Add(new
ListItem("Province du Quebec", "PQ"));
returnCollection.Add(new
ListItem("Puerto Rico", "PR"));
returnCollection.Add(new
ListItem("Rhode Island", "RI"));
returnCollection.Add(new
ListItem("Saskatchewan", "SK"));
returnCollection.Add(new
ListItem("South Carolina", "SC"));
returnCollection.Add(new
ListItem("South Dakota", "SD"));
returnCollection.Add(new
ListItem("Tennessee", "TN"));
returnCollection.Add(new
ListItem("Texas", "TX"));
returnCollection.Add(new
ListItem("Utah", "UT"));
returnCollection.Add(new
ListItem("Vermont", "VT"));
returnCollection.Add(new
ListItem("Virgin Islands", "VI"));
returnCollection.Add(new
ListItem("Virginia", "VA"));
returnCollection.Add(new
ListItem("Washington", "WA"));
returnCollection.Add(new
ListItem("West Virginia", "WV"));
returnCollection.Add(new
ListItem("Wisconsin", "WI"));
returnCollection.Add(new
ListItem("Wyoming", "WY"));
returnCollection.Add(new
ListItem("Yukon Territory", "YT"));
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// Return it
return returnCollection;
}
}
}
}
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-----Original Message-----
From: Dave Hickey [mailto:Click here to reveal e-mail address]=20
Sent: Friday, August 17, 2001 2:54 PM
To: aspngcontrolsvb
Subject: [aspngcontrolsvb] inheriting from a datalist
=20
Hello -
=20
It seems to me, I read somewhere that you can inherit and customize an
asp control, such as a datagrid, to add functionality, etc.
=20
I would like to extend the asp:dropdownlist control, because I just want
to add some common database code to it. Is there a way to do this?
=20
When I try to=20
Inherits System.Web.UI.WebControls.DropDownList
it gives me an error saying that the control has to inherit from
UserClass instead.
Any suggestions?
-Dave
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	System.Web.UI.WebControls.DropDownList
	System.Web.UI.WebControls.ListItem
	System.Web.UI.WebControls.ListItemCollection

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