A value for XXX is required...

Problem

You get this error after entering data into a form in your application:

Please correct the following errors:

- A value for XXX is required.

Required data was not entered

This error occurs when a field is required and the user fails to enter a value into the web form. Enter the data into the required field and click ‘OK’ or ‘Save’.

In some cases, a required field may not be visible on the web page. Correct this design error by adding the field to the web page or by setting an initial value for the field so it always has a default value.

Your .NET Framework requires software patches

This error can occur when your .NET Framework 2.0 is out of date and requires software patch updates. Older versions of the .NET Framework cause the onClick event to incorrectly trigger form validation. Use the Microsoft Windows Update feature to select and apply all software patches for your .NET Framework.

You are using FCKEditor and have the ‘Required’ field property enabled

If you use a third-party control like FCKEditor for a field that that requires validation (‘Required’ is selected in the Property Sheet) you will get this warning from your browser when saving the page, even though the input field is not empty. This happens because the Microsoft .NET <asp:RequiredFieldValidator> tag can’t properly operate with non-ASP controls like FCKEditor.

To correct this, you can:

Change the “Display style” property to “ASP Multi-line” via the Property Sheet if you need to validate this input field.
Disable the ‘Required’ property in the Property Sheet if you prefer to use the Rich Text Editor rather than validate the input field value.