Creating a strongly typed PreviousPage (p591)

cobberas63 · April 12th, 2011, 11:27 PM

On the Try It Out for Creating a strongly typed PreviousPage (p591), I'm getting the following error once I've typed in all the code:

Quote:

The type or namespace name 'RegistrationInfo' could not be found (are you missing a using directive or an assembly reference?)

in the files ResultsPage.aspx.cs and Registration.aspx.cs

I'm guessing that the files aren't 'seeing' the RegistrationInfo class that's been added. Any ideas on how to achieve this?

cobberas63

whiterainbow · April 13th, 2011, 07:33 AM

Where you added your RegistrationInfo Class? Whether you added it to a new class file that is having a different namespace? If so refer the namespace (using Namespace;)/access the class with fully typed name (Namespace.RegistrationInfo a=new Namespace.RegistrationInfo();) in the pages and your problem will be solved.

cobberas63 · April 14th, 2011, 03:02 AM

None of the pages I created have a namespace definition the way the code samples have in the book, but they seem to work OK anyhow - I'm guessing that's because the files are all stored in the same folder (called ...\EventRegistrationWeb\) - is that correct?

When I first added the class (i.e. created the file RegistrationInfo.cs), the Visual Web Developer told me that new classes are usually stored in a folder called App_Code, and asked me if I wanted to create both the class & the folder. At first I said "no" and the class (i.e. RegistrationInfo.cs) sat in the same folder as all the other files - that's when I was getting the error.

Then I created the App_Code folder suggested by the Visual Web Developer and stored the class in there, and the application now works without error even without a namespace.

Is this an incorrect way of doing things?

Thanks for your help
cobberas63

whiterainbow · April 14th, 2011, 03:24 AM

Yes. When you are creating a website using the Visual Web Developer, the classes won't have any hierarchy or accessibility. When the code file is placed under the App_Code, the compiler will look into the folder to get the classes. If you are placing your code outside the App_Code folder you organize all your classes under strongly typed namespace but putting the code files outside the App_Code folder is not secure and so not advisable. So put the code files under the App_Code folder with namespace.

Happy Coding...

cobberas63 · April 15th, 2011, 03:29 AM

Cool. Thanks heaps!
:-) C/