Asp.Net dynamic controls postback

Question

I have an asp page where controls are dynamically added from the DB on Page_Init() The EnableViewState is set to false.

One of the dynamic controls is a CheckBox and when checked it causes postback.

Now on Page_Init I repopulate my page (after changing according to rules) and the checkbox's checked property is now false.

It stays false up to the end of LoadPageStateFromPersistenceMedium() from what I can see.

protected override object LoadPageStateFromPersistenceMedium()
{
    Control cntrl = Page.FindControl("FINS10CopyAddress");
    Boolean check = ((CheckBox)cntrl).Checked;
    return null;
}

Then suddenly its true again on OnPreLoad().

 protected override void OnPreLoad(EventArgs e)
    {
    Control cntrl = Page.FindControl("FINS10CopyAddress");
    Boolean check = ((CheckBox)cntrl).Checked;
    }

If I do the same with another control's visible property it works.

Any ideas what can cause this or suggested methods to override to not load previous state ?

The Answer below helped me to create a workaround:

dataValue cntrl = ((Helper)Session["helper"]).Event.Control(Request["__EVENTTARGET"]);
if (cntrl != null)
{
    if (cntrl is webCheckBox)
        ((CheckBox)Page.FindControl(Request["__EVENTTARGET"])).Checked = (Boolean)cntrl.Value;
}

This sounds exactly like viewstate is populating your control. Have you checked your viewstate object in debug mode to make sure the viewstate is not loaded? — TBohnen.jnr

TBohnen.jnr TBohnen.jnr · Accepted Answer · 2011-05-13T05:44:32

EDIT

It is the postback data setting the control, in your LoadPageStateFromPersistenceMedium() see:

var val = Request[Request["__EVENTTARGET"]];

Unfortunately the Request object is readonly

I don't know of any other way to stop it from setting the value to what it was changed to on the client side except to set the value to what you want it in LoadPageStateFromPersistenceMedium() after the postbackdata has been set.

Asp.Net dynamic controls postback

1 Answers