validating user control

5 Apr 2006 10:21 AM

l.holmes

Hi

I have a user control which is made up of an Infragistics web date chooser
and a text box.

What I would like to do is validate the date selected in the web date
chooser using a required field validator and also a range validator control.
I have tried doing this but when setting the ControlToValidate property to
the user control I get an error stating

the control referenced by ControlToValidate cannot be validated

Is there a way for me to enable this user control to be validated using the
..net validator controls?

I have looked very hard on the net for articles and help but I could not
find much on this topic.

Thanks

Lewis Holmes
eNate

6 Apr 2006 2:15 AM

Steven Cheng[MSFT]

Hi Lewis,

Welcome to the ASPNET newsgroup.

As fro the making ASP.NET usercontrol(ascx ?) be validated by the built-in
validation controls, based on my understanding, so far we can extend our
own server controls to be validatable by built-in server controls through
server-side validation. To do this, we should expose a certain public
property which associate to the data in our control (need to validate by
other validators). Then, use the ValidationPropertyAttribute to decorate
that property on the control:

#How to extend a Web form control to work with the validation controls by
using Visual C#
http://support.microsoft.com/kb/310145/en-us

also, this is mainly used for custom server control rather than
usercontrol. For your scenario, we need to define a
custom property on the usercontrol to expose the inner control's
property(which need valdation). e.g;

[ValidationProperty("ImageUrl")]
public partial class UserControls_HelloUCl : System.Web.UI.UserControl
{
    public string ImageUrl
    {
        get
        {
            return txtInput.Text;
        }

        set
        {
            txtInput.Text = value;
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = ImageUrl;
    }
}

And on the ASP.NET page, the design-time "ControlToValidate" dropdown won't
automatically popultae the usercontrol in the list, we need to manually
input the usercontrol's ID into the field (Make sure the usercontrol is in
the same naming container with the validator, otherwise, the validator can
not find it at runtime).

Hope this helps.

Regards,

Steven Cheng
Microsoft Online Community Support

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