Dynamic control array loading, can't unload control/replace with o

[cindy]

I have a web form with 3 links, depending on which link is clicked a user
control loads, page1.ascx,page 2.ascx,page3.as cx

page1.ascx does a search, uses 3 asp:dropdownlis ts with viewstate true and
auto post back. It loads by default first time.

User clicks on link 2, page2.ascx loads after page1.ascx I need the loaded
control to go away when a different one is clicked, I have seen similar
stuff on threads but I can't understand a clear answer on what syntax and
where in the order?

I do not understand the syntax for controls.remove the sample says
control.remove where control.name =
and there is no controls.name in c sharp syntax for this? Also I am using
control array see below

private void OnPageButtonCli ck(object sender, System.EventArg s e)
{
LinkButton pageButton = (LinkButton)sen der;
string pageNumber = pageButton.ID.S ubstring("_page Button".Length) ;
ActiveTab = pageNumber;
SelectPage(page Number);
}
public void SelectPage(stri ng pageNumber)
{
Control page = LoadControl(Str ing.Format("Pag e{0}.ascx", pageNumber));
_content.Contro ls.Add(page);
LinkButton pageButton = FindControl(Str ing.Format("_pa geButton{0}",
pageNumber)) as LinkButton;
if (pageButton != null)
{
pageButton.Back Color = Color.Gold;
pageButton.CssC lass = "tabon";
}
LastActiveContr ol = page.ID.ToStrin g();
}
--
cindy mello

[Visar Gashi, MCP]

I'm assuming your "_content" is a container Control. If so, try
_content.Contro ls.Clear(); before you add the next control.

"cindy" wrote:

I have a web form with 3 links, depending on which link is clicked a user
control loads, page1.ascx,page 2.ascx,page3.as cx

page1.ascx does a search, uses 3 asp:dropdownlis ts with viewstate true and
auto post back. It loads by default first time.

User clicks on link 2, page2.ascx loads after page1.ascx I need the loaded
control to go away when a different one is clicked, I have seen similar
stuff on threads but I can't understand a clear answer on what syntax and
where in the order?

I do not understand the syntax for controls.remove the sample says
control.remove where control.name =
and there is no controls.name in c sharp syntax for this? Also I am using
control array see below

private void OnPageButtonCli ck(object sender, System.EventArg s e)
{
LinkButton pageButton = (LinkButton)sen der;
string pageNumber = pageButton.ID.S ubstring("_page Button".Length) ;
ActiveTab = pageNumber;
SelectPage(page Number);
}
public void SelectPage(stri ng pageNumber)
{
Control page = LoadControl(Str ing.Format("Pag e{0}.ascx", pageNumber));
_content.Contro ls.Add(page);
LinkButton pageButton = FindControl(Str ing.Format("_pa geButton{0}",
pageNumber)) as LinkButton;
if (pageButton != null)
{
pageButton.Back Color = Color.Gold;
pageButton.CssC lass = "tabon";
}
LastActiveContr ol = page.ID.ToStrin g();
}
--
cindy mello

[Steven Cheng[MSFT]]

Hi Cindy,

I've also noticed your another previous post in the

" 03 dropdownlist selectedindexch anged not firing in usercontrol on"

microsoft.publi c.dotnet.framew ork.aspnet.webc ontrols

newsgroup, I've also attached a demo package there. Have you had a chance
to test it? Also, as for the unloading usercontrol, I think we should
follow the following two steps according to my description in the former
thread:

1. In the first postback of the 3rd link(which will remove the first 2
usercontrols), we can use Container.Contr ols.Clear to clear the control
collection, we can also use Controls.Remove to remove the control instance
from it's parent collection( use FindControl to get the reference first)

2. Also, set the flag in ViewState accordingly since the sequential
postback will create dynamic controls denpending on these values.

If have anything unclear or have any problems accessing the demo pages I
attached there, please feel free to post here.

Thanks,

Steven Cheng
Microsoft Online Support

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