Web Forms :: Element 'LengthValidator' Is Not A Known Element?

Aug 30, 2010

I got this errors while trying to use an example from the ASP.NET 3.5 Unleashed book.

Webform1.aspx

[Code]....

LengthValidator.cs

[Code]....

As from the book's note, I think I added this line correctly:

[Code]....

However, the compiler kept complaining that:

Warning 1 Element 'LengthValidator' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is missing. C:Visual Studio 2010 ASP.NET ProjectsWebApplicationFourWebApplicationFourWebForm1.aspx 16 17 WebApplicationFour

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