What those methods for?

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5/13/2010 4:37:08 PM
konstantin
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What those methods for?

Hi, I'm developing my own controls and some methods not clear for me.

I took for example code of CountryStateSetting.ascx (Web/Controls); I put in my control a DropDownList, which I am filling in the Page_Load and this method fires twice, so I'm getting double values in my dropdownlist.

There is an example of original CountryStateSetting.ascx

protected override void OnInit(EventArgs e)
{
base.OnInit(e);
this.Load += new EventHandler(Page_Load);
EnsureControls();
ddCountry.SelectedIndexChanged += new EventHandler(ddCountry_SelectedIndexChanged);
}

Why Joe add this EventHandler? this.Load += new EventHandler(Page_Load); When I comment this string, my DropDownList began populated correctly (one time).

And why Joe are using EnsureControls()  procedure? Why is that for?

5/14/2010 11:08:06 AM
Joe Audette
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Re: What those methods for?

Hi Konstantin,

In your custom control in the .ascx file, make sure you have AutoEventWireup="false" if you are wiring up the event yourself and this is true then the event is wired twice so it fires twice.

My recollection is that I needed the EnsureControls because in Module Settings we are loading this control dynamically (ie it is not a control declared in the page). So in this case with a dynamically loaded control it must be re-created again on postback and this method prevented a possible null reference exception if the event sequence was different than the page event sequence due to the timing of when the control s created on postback.

Hope it helps,

Joe

5/14/2010 1:16:09 PM
konstantin
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Re: What those methods for?

Thanks, Joe!

Now it's working like it should :) I forgot to set AutoEventWireup to false

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