CODEWITHSUNDEEP
asp.netupdatepaneluser-controlsplaceholder
user387635
user387635

Reputation: 41

UserControl, PlaceHolder and UpdatePanel On PostBack

I dynamically load a User Control, with an Update Panel inside a Place Holder.

When I click a button from the User Control, should refresh the Update Panel contents, but it refresh the entire page instead, and the User Control is disappearing from the page, because the page's Page_Load does not load anything if it's a PostBack.

How I can fix it?

Upvotes: 1

Views: 2341

Answers (4)

Elim Garak
Elim Garak

Reputation: 1817

You need to add the control page to the page in the page_init method. It has to be added on each post back. The control will retain all the values even after adding it back.

There is a full working example at this link.

Upvotes: 0

Dindar
Dindar

Reputation: 3235

Whenever a partial or full postback happen , Automatically all update() method of all updatepanels fire . For preventing such this behavior you need to set UpdateMode="Conditional" property . In this situation you need to specify asynchronous trigger Or ChildrenAsTriggers=true .

for preventing a dynamically loaded-usercontrol to be disappear ,It's good to save it in ViewState , Here is a tutorial and sample application

Upvotes: 2

matt-dot-net
matt-dot-net

Reputation: 4244

Make sure you are creating the control EVERY page request, regardless of GET/POST. Also, make sure you are giving it the same ID.

I like to override the CreateChildControls method.

Upvotes: 0

aape
aape

Reputation: 517

I think you'll need to reinject the control in page_load or pre_render. Dynamically created controls don't live through postback.

Upvotes: 0

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