Page.IsValid changes to false after button click

[Andrew Jocelyn]

Hi

I have couple of dropdown controls each with a requiredfieldva lidator. 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(ob ject sender, EventArgs e)
{
ddl.ClearSelect ion();
Trace.Write(Pag e.Validators[0].IsValid.ToStri ng()); // returns True
}

protected override void OnPreRender(Eve ntArgs e)
{
Trace.Write(Pag e.Validators[0].IsValid.ToStri ng()); // returns False
base.OnPreRende r(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

[=?Utf-8?B?YnJ1Y2UgYmFya2Vy?=]

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 requiredfieldva lidator. 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(ob ject sender, EventArgs e)
{
ddl.ClearSelect ion();
Trace.Write(Pag e.Validators[0].IsValid.ToStri ng()); // returns True
}
>
protected override void OnPreRender(Eve ntArgs e)
{
Trace.Write(Pag e.Validators[0].IsValid.ToStri ng()); // returns False
base.OnPreRende r(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
>
>
>