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DropDownList

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This message was discovered on ASPFriends.com 'aspngvb' list.

Kladiva, Jay

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I have a DropDownList and I what to set the selected item when a user
returns. When I step through the code, the SelectedItem.Value is changed to
the value I pass in from the QueryString which matches the value of one of
the items in the list, but when the page renders nothing is selected. Any
ideas?

Dim dtb As New DataTable()

'Code to get valid DataTable with rows

ddlLevel.DataSource = dtb

ddlLevel.DataTextField = "LevelDesc"

ddlLevel.DataValueField = "SearchLevelKey"

ddlLevel.DataBind()

If Request.QueryString("mode") = "edit" Then

ddlLevel.SelectedItem.Value = Request.QueryString("levelid")

End If

-----Original Message-----
From: Jesse Liberty [mailto:Click here to reveal e-mail address]
Sent: Friday, March 22, 2002 4:34 PM
To: aspngvb
Subject: [aspngvb] RE: even handling in VB.NET vs. C#

Never mind; got the answer thanks. The answer is yes, VB creates the
delegate and check before invoking.

-j

-------------------------------
Jesse Liberty
Liberty Associates, Inc.
.NET Training & Development
http://www.LibertyAssociates.com <http://www.libertyassociates.com/>

-----Original Message-----
From: Jesse Liberty [mailto:Click here to reveal e-mail address]
Sent: Friday, March 22, 2002 3:16 PM
To: aspngvb
Subject: [aspngvb] even handling in VB.NET vs. C#

I notice that in C# when you want to raise an event you test that the event
has a handler registered, and then you call the handler directly,

if (ClickApply != null)
ClickApply(this, new EventArgs());

In VB.NET you do no test, but you call RaiseEvent ClickApply(this, new
EventArgs());

Am I right that VB.NET is doing the test for you (hidden somewhere) or is
the mechanism just different?

-------------------------------
Jesse Liberty
Liberty Associates, Inc.
.NET Training & Development
http://www.LibertyAssociates.com <http://www.libertyassociates.com/>

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">

<META content="MSHTML 6.00.2600.0" name=GENERATOR></HEAD>
<BODY>
<DIV>
I have a DropDownList
and I what to set the selected item when a user returns. When I step
through the code, the SelectedItem.Value is changed to the value I pass in from
the QueryString which matches the value of one of the items in the
list, but when the page renders nothing is selected. Any
ideas?
 Dim dtb
As New
DataTable()
 
'Code to get valid
DataTable with rows
 
ddlLevel.DataSource = dtb
ddlLevel.DataTextField = "LevelDesc"
ddlLevel.DataValueField = "SearchLevelKey"
ddlLevel.DataBind()
If Request.QueryString("mode") = "edit"
Then
 ddlLevel.SelectedItem.Value =
Request.QueryString("levelid")
End If
 
 </DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left>-----Original Message----- From: Jesse Liberty
[mailto:Click here to reveal e-mail address] Sent: Friday, March 22, 2002
4:34 PM To: aspngvb Subject: [aspngvb] RE: even handling
in VB.NET vs. C# </DIV>
<DIV>Never mind; got the answer thanks. The answer is yes, VB creates the
delegate and check before invoking.</DIV>
<DIV> </DIV>
<DIV>-j</DIV>
<DIV> </DIV>
------------------------------- Jesse Liberty Liberty
Associates, Inc. .NET Training & Development <A
href="http://www.libertyassociates.com/"" target="_blank">http://www.libertyassociates.com/";
target=_blank>http://www.LibertyAssociates.com</A> 
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid">
<DIV class=OutlookMessageHeader dir=ltr align=left>-----Original Message----- From: Jesse Liberty
[mailto:Click here to reveal e-mail address] Sent: Friday, March 22,
2002 3:16 PM To: aspngvb Subject: [aspngvb] even
handling in VB.NET vs. C# </DIV>
<DIV>I notice that in
C# when you want to raise an event you test that the event has a handler
registered, and then you call the handler directly,</DIV>
<DIV> </DIV>
<DIV>if (ClickApply
!= null) ClickApply(this, new
EventArgs());</DIV>
<DIV> </DIV>
<DIV>In VB.NET you do
no test, but you call RaiseEvent ClickApply(this, new
EventArgs());</DIV>
<DIV> </DIV>
<DIV>Am I right that
VB.NET is doing the test for you (hidden somewhere) or is the mechanism just
different?</DIV>
<DIV> </DIV>
<DIV> </DIV>
------------------------------- Jesse Liberty Liberty
Associates, Inc. .NET Training &
Development <A href="http://www.libertyassociates.com/"" target="_blank">http://www.libertyassociates.com/";
target=_blank>http://www.LibertyAssociates.com</A> 
<DIV> </DIV>| [aspngvb] member Click here to reveal e-mail address = YOUR ID
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Reply to this message...

Andy Smith

what you are doing is changing the value of the selected item. instead find the item with that value and make it selected
for instance
ddlLevel.SelectedIndex = ddlLevel.Items.IndexOf( ddlLevel.Items.FindByValue( Request.QueryString("levelid") )

personally, I believe they should have written a SelectByValue method and a SelectByText method, but hey, you could always subclass.

__
Andy Smith
Keyboard Jockey #3a7-2.78.1

-----Original Message-----
From: Kladiva, Jay [mailto:Click here to reveal e-mail address]
Sent: Tuesday, June 25, 2002 9:21 AM
To: aspngvb
Subject: [aspngvb] DropDownList

I have a DropDownList and I what to set the selected item when a user returns. When I step through the code, the SelectedItem.Value is changed to the value I pass in from the QueryString which matches the value of one of the items in the list, but when the page renders nothing is selected. Any ideas?

Dim dtb As New DataTable()

'Code to get valid DataTable with rows

ddlLevel.DataSource = dtb

ddlLevel.DataTextField = "LevelDesc"

ddlLevel.DataValueField = "SearchLevelKey"

ddlLevel.DataBind()

If Request.QueryString("mode") = "edit" Then

ddlLevel.SelectedItem.Value = Request.QueryString("levelid")

End If

-----Original Message-----
From: Jesse Liberty [mailto:Click here to reveal e-mail address]
Sent: Friday, March 22, 2002 4:34 PM
To: aspngvb
Subject: [aspngvb] RE: even handling in VB.NET vs. C#

Never mind; got the answer thanks. The answer is yes, VB creates the delegate and check before invoking.

-j

-------------------------------
Jesse Liberty
Liberty Associates, Inc.
.NET Training & Development
http://www.LibertyAssociates.com <http://www.libertyassociates.com/>

-----Original Message-----
From: Jesse Liberty [mailto:Click here to reveal e-mail address]
Sent: Friday, March 22, 2002 3:16 PM
To: aspngvb
Subject: [aspngvb] even handling in VB.NET vs. C#

I notice that in C# when you want to raise an event you test that the event has a handler registered, and then you call the handler directly,

if (ClickApply != null)
ClickApply(this, new EventArgs());

In VB.NET you do no test, but you call RaiseEvent ClickApply(this, new EventArgs());

Am I right that VB.NET is doing the test for you (hidden somewhere) or is the mechanism just different?

-------------------------------
Jesse Liberty
Liberty Associates, Inc.
.NET Training & Development
http://www.LibertyAssociates.com <http://www.libertyassociates.com/>

| [aspngvb] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/asplists/aspngvb.asp = JOIN/QUIT

| [aspngvb] member Click here to reveal e-mail address = YOUR ID | http://www.asplists.com/asplists/aspngvb.asp = JOIN/QUIT

Reply to this message...

Jaison Green

myDropDownList.Items.FindByValue(Request.QueryString["levelid"]).Selecte
d = true;

Jaison Green
Hunt Interactive
425*746*7880

-----Original Message-----
From: Kladiva, Jay [mailto:Click here to reveal e-mail address]
Sent: Tuesday, June 25, 2002 8:21 AM
To: aspngvb
Subject: [aspngvb] DropDownList

I have a DropDownList and I what to set the selected item when a user
returns. When I step through the code, the SelectedItem.Value is
changed to the value I pass in from the QueryString which matches the
value of one of the items in the list, but when the page renders nothing
is selected. Any ideas?

Dim dtb As New DataTable()

'Code to get valid DataTable with rows

ddlLevel.DataSource = dtb

ddlLevel.DataTextField = "LevelDesc"

ddlLevel.DataValueField = "SearchLevelKey"

ddlLevel.DataBind()

If Request.QueryString("mode") = "edit" Then

ddlLevel.SelectedItem.Value = Request.QueryString("levelid")

End If

 -----Original Message-----
 From: Jesse Liberty [mailto:Click here to reveal e-mail address]
 Sent: Friday, March 22, 2002 4:34 PM
 To: aspngvb
 Subject: [aspngvb] RE: even handling in VB.NET vs. C#

 Never mind; got the answer thanks. The answer is yes, VB creates
the delegate and check before invoking.

 -j


 -------------------------------
 Jesse Liberty
 Liberty Associates, Inc.
 .NET Training & Development
 http://www.LibertyAssociates.com
<http://www.libertyassociates.com/>

 -----Original Message-----
 From: Jesse Liberty
[mailto:Click here to reveal e-mail address]
 Sent: Friday, March 22, 2002 3:16 PM
 To: aspngvb
 Subject: [aspngvb] even handling in VB.NET vs. C#


 I notice that in C# when you want to raise an event you
test that the event has a handler registered, and then you call the
handler directly,

 if (ClickApply != null)
 ClickApply(this, new EventArgs());

 In VB.NET you do no test, but you call RaiseEvent
ClickApply(this, new EventArgs());

 Am I right that VB.NET is doing the test for you (hidden
somewhere) or is the mechanism just different?



 -------------------------------
 Jesse Liberty
 Liberty Associates, Inc.
 .NET Training & Development
 http://www.LibertyAssociates.com
<http://www.libertyassociates.com/>


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ID | http://www.asplists.com/asplists/aspngvb.asp = JOIN/QUIT

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Reply to this message...

Carlos Magalhaes

This is a work around first what you should do is a response.write or
trace.write to see if the value is actually being passed back to the pages
and/or control!

If it is you can set that value to be the first value in your index use this
code

mydropdown.Items.Insert(0, '" & leveled & "')

That should do it but first do yourself a favor and check if he value is
being passed back first!

HTH

Carlos

-----Original Message-----
From: Kladiva, Jay [mailto:Click here to reveal e-mail address]
Sent: Tuesday, June 25, 2002 5:21 PM
To: aspngvb
Subject: [aspngvb] DropDownList

I have a DropDownList and I what to set the selected item when a user
returns. When I step through the code, the SelectedItem.Value is changed to
the value I pass in from the QueryString which matches the value of one of
the items in the list, but when the page renders nothing is selected. Any
ideas?

Dim dtb As New DataTable()

'Code to get valid DataTable with rows

ddlLevel.DataSource = dtb

ddlLevel.DataTextField = "LevelDesc"

ddlLevel.DataValueField = "SearchLevelKey"

ddlLevel.DataBind()

If Request.QueryString("mode") = "edit" Then

ddlLevel.SelectedItem.Value = Request.QueryString("levelid")

End If

-----Original Message-----
From: Jesse Liberty [mailto:Click here to reveal e-mail address]
Sent: Friday, March 22, 2002 4:34 PM
To: aspngvb
Subject: [aspngvb] RE: even handling in VB.NET vs. C#

Never mind; got the answer thanks. The answer is yes, VB creates the
delegate and check before invoking.

-j

-------------------------------
Jesse Liberty
Liberty Associates, Inc.
.NET Training & Development
http://www.LibertyAssociates.com <http://www.libertyassociates.com/>

-----Original Message-----
From: Jesse Liberty [mailto:Click here to reveal e-mail address]
Sent: Friday, March 22, 2002 3:16 PM
To: aspngvb
Subject: [aspngvb] even handling in VB.NET vs. C#

I notice that in C# when you want to raise an event you test that the event
has a handler registered, and then you call the handler directly,

if (ClickApply != null)
ClickApply(this, new EventArgs());

In VB.NET you do no test, but you call RaiseEvent ClickApply(this, new
EventArgs());

Am I right that VB.NET is doing the test for you (hidden somewhere) or is
the mechanism just different?

-------------------------------
Jesse Liberty
Liberty Associates, Inc.
.NET Training & Development
http://www.LibertyAssociates.com <http://www.libertyassociates.com/>

| [aspngvb] member Click here to reveal e-mail address = YOUR ID |
http://www.asplists.com/asplists/aspngvb.asp = JOIN/QUIT

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	System.Data.DataTable
	System.EventArgs
	System.Web.UI.WebControls.DropDownList

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