How do I remove a custom control and add it again with the same id

Question

0.00/5 (No votes)

See more:

Hi there, I'm hoping one of you guys can help me out here.

I'm using vb.net

I have a web page that holds a user control on it. Quite a few functions/subs etc. reference it by it's ID (as you would expect)

Once the user control has done all it needs to, It would be much, much easier for me to remove the object and reload it, but the new control would need to use the same ID.

So I've tried this :

Dim Old_User_ctrl As Control
Old_User_ctrl= Me.FindControl("MyControl1")
divPlaceholder.Controls.Remove(Old_User_ctrl)

Dim NEW_User_ctrl As New Control
NEW_User_ctrl = LoadControl("~\Controls\MyControl.ascx")
NEW_User_ctrl.ID = "MyControl1"
divPlaceholder.Controls.Add(NEW_User_ctrl)

However; once I continue running through my code, I've found that I get an error :

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Multiple controls with the same ID 'MyControl1' were found. FindControl requires that controls have unique IDs.

Can anyone tell me how to properly dispose of the user control object ?

Thanks folks,
Wotney

Posted 7-Dec-10 9:47am

Wotney

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

vivekse · Answer 1 · 2010-12-07T23:39:00

Solution 1

Hi Wontbey,

Try this,

Set Old_User_ctrl = nothing

Posted 7-Dec-10 23:39pm

vivekse

Wotney · Answer 2 · 2010-12-08T00:34:00

Unfortunately not.
Once I run

Dim Old_User_ctrl As Control
Old_User_ctrl= Me.FindControl("MyControl1")
divPlaceholder.Controls.Remove(Old_User_ctrl)

Old_User_ctrl = Nothing

I break the code and using the immediate window I can still get to the control eg.

?MyControl1.ID
"MyControl1"

and later in the code I get the same error as before...

Multiple controls with the same ID 'MyControl1' were found.

But - I have worked around my problem now using a different technique. I have basically reset all of the existing control's variables, child controls etc. So I can use it like it was a fresh control.

So, I've solved my immediate problem, but if anyone can answer my original question - that'd be great for future reference !

Thanks :)