Page.IsValid changes to false after button click

Hi

I have couple of dropdown controls each with a requiredfieldvalidator. I
clear the dropdownlist in the button click event. When the page is rendered
the dropdown validator already flags it's error message. I checked the
IsValid property in the prerender event and it says it's false.

protected void Button_Click(object sender, EventArgs e)
{
ddl.ClearSelection();
Trace.Write(Page.Validators[0].IsValid.ToString()); // returns True
}

protected override void OnPreRender(EventArgs e)
{
Trace.Write(Page.Validators[0].IsValid.ToString()); // returns False
base.OnPreRender(e);
}

What could be happening to change the IsValid property to false? I can't see
anything in my code which would do this. What's the best way to debug this?
What other checks should I be making?

Many thanks
Andrew

RE: Page.IsValid changes to false after button click

Page.IsValid runs the validation logic. so if you clear a selection, then use
Page.IsValid to run a validation check, it will fail.

-- bruce (sqlwork.com)


"Andrew Jocelyn" wrote:

> Hi
>
> I have couple of dropdown controls each with a requiredfieldvalidator. I
> clear the dropdownlist in the button click event. When the page is rendered
> the dropdown validator already flags it's error message. I checked the
> IsValid property in the prerender event and it says it's false.
>
> protected void Button_Click(object sender, EventArgs e)
> {
> ddl.ClearSelection();
> Trace.Write(Page.Validators[0].IsValid.ToString()); // returns True
> }
>
> protected override void OnPreRender(EventArgs e)
> {
> Trace.Write(Page.Validators[0].IsValid.ToString()); // returns False
> base.OnPreRender(e);
> }
>
> What could be happening to change the IsValid property to false? I can't see
> anything in my code which would do this. What's the best way to debug this?
> What other checks should I be making?
>
> Many thanks
> Andrew
>
>
>

Re: Page.IsValid changes to false after button click

Hi Bruce

That doesn't seem to be the case in my simple test with a single validator
on a page. The Page.IsValid value does not change how ever many times I call
it. However it does change in my project page which contains a FormView
control with a number of UserControls. What I don't seem to be able to do is
find out where or why it's changing.

Any ideas?

Thanks
Andrew

Re: Page.IsValid changes to false after button click

Hi Andrew,

According to your description, I've performed some tests, it seems a simple
page with dropdownlist and requiredFieldValidator will not produce the
exact behavior. Here is a simple test page I used:

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