Inherited TextBox

[Sehboo]

All,

I want to create a custom control which is actually inherited from a
textbox. This custom control will have one more field called
Required. If requires is set to TRUE then before user can post this
page (by clicking button or something), I want to make sure that text
field is not empty. If it is empty then I want to throw an exception.

I am not sure how to achieve this. I know how to inherit controls.

Any help is appreciated.

Thanks

 

[Victor Garcia Aprea [MVP]]

Hi Sehboo,

You will need to output some javascript code from your custom control in
order to intercep the form submission and only allow it if the textbox value
is not empty. Regarding your req to throw an exception, do you mean for
devices not supporting javascript in which case the textbox's value may be
posted emtpy? If so, from your custom control you could check that value and
throw an exception right away...

--
Victor Garcia Aprea
Microsoft MVP | ASP.NET
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