DropDownList & Viewstate

[jwnews1231@gmail.com]

Hi,

I've been working on minimizing the use of the ViewState in my asp.net
applications because of its overhead. The problem I am having is that
I keep losing SelectedIndex in the DropDownLists. I don't lose the
SelectedIndex when the ViewState is enabled, only when it is off.

I have a dropdownlist named countryCbo inside of a UserControl and
countryCbo's EnableViewState property is false. In the OnInit()
method of the UserCountry it loads the country list from the database
and DataBinding it.

public void LoadCountryList () {
// SQL Stuff ...

this.countryCbo .DataTextField = "Name";
this.countryCbo .DataValueField = "Code";
this.countryCbo .DataSource = countries;
this.countryCbo .DataBind();
}

// Doing this will load the countries but I lose the SelectedIndex on
a postback.
protected override void OnInit(EventArg s e) {
LoadCountryList ();
base.OnInit(e);
}

// Doing this will load the countries but when a postback occurs I
lose all the countries and the list is empty.
protected override void OnInit(EventArg s e) {
if (!Page.IsPostBa ck) {
LoadCountryList ();
}
base.OnInit(e);
}

I have read somewhere that the SelectedIndex resets back to -1 if a
databind occurs. Would that be the case?
Could someone tell me how they have gotten their dropdownlists to work
without the ViewState being enabled?

Thank you!

JW

[=?Utf-8?B?QW5nZWw=?=]

RE: DropDownList & Viewstate

// Enable postback for the dropdown

// in page load event

int ndx = page.request("D ropDownList1");

// Now do you databinding

// then restore the selected index

DropDownList1.S electedIndex = ndx;


--
aaa


"jwnews1231@gma il.com" wrote:

Hi,
>
I've been working on minimizing the use of the ViewState in my asp.net
applications because of its overhead. The problem I am having is that
I keep losing SelectedIndex in the DropDownLists. I don't lose the
SelectedIndex when the ViewState is enabled, only when it is off.
>
I have a dropdownlist named countryCbo inside of a UserControl and
countryCbo's EnableViewState property is false. In the OnInit()
method of the UserCountry it loads the country list from the database
and DataBinding it.
>
public void LoadCountryList () {
// SQL Stuff ...
>
this.countryCbo .DataTextField = "Name";
this.countryCbo .DataValueField = "Code";
this.countryCbo .DataSource = countries;
this.countryCbo .DataBind();
}
>
// Doing this will load the countries but I lose the SelectedIndex on
a postback.
protected override void OnInit(EventArg s e) {
LoadCountryList ();
base.OnInit(e);
}
>
// Doing this will load the countries but when a postback occurs I
lose all the countries and the list is empty.
protected override void OnInit(EventArg s e) {
if (!Page.IsPostBa ck) {
LoadCountryList ();
}
base.OnInit(e);
}
>
I have read somewhere that the SelectedIndex resets back to -1 if a
databind occurs. Would that be the case?
Could someone tell me how they have gotten their dropdownlists to work
without the ViewState being enabled?
>
Thank you!
>
JW
>

[jwnews1231@gmail.com]

Re: DropDownList & Viewstate

Thanks alot, that fixed it. I didn't think to check the Request's
Form variable for the UniqueID of the control.

JW