Alan Northam - All Comments

re: Getting Started with NHibernate: Part IV

twister — Mon, 29 Dec 2008 07:40:42 GMT

Again me.

I solved this.

I manually added a record to Database Application table with name "NHBlog".

re: Getting Started with NHibernate: Part IV

twister — Fri, 26 Dec 2008 08:52:17 GMT

After some effort I can run it with vs.2008

But I cant still pass login page. Now error like this

"not-null property references a null or transient value: NHBlog.BusinessEntities.Security.User.Application"

in membership providers.

re: Getting Started with NHibernate: Part IV

twister — Thu, 25 Dec 2008 15:57:44 GMT

I cant run the application. It gives error in web.config about roleprovider.

Why do you think?

re: Getting Started with NHibernate: Part I

joe — Thu, 04 Dec 2008 21:30:29 GMT

part 2?

re: Getting Started with NHibernate: Part IV

George Fitch — Fri, 28 Nov 2008 15:59:08 GMT

The zip file is bad, but is usable. Extract the file, rename it to something with a .zip extension and that new zip file is good.

re: ADO.NET, Nullable Types, Casting DBNull and You

kirti — Wed, 19 Nov 2008 08:10:28 GMT

Cannot set Column 'colunm name' to be null. Please use DBNull instead.

re: Getting Started with NHibernate: Part II

Swarup — Fri, 07 Nov 2008 14:21:32 GMT

I was wondering if the part 3 and 4 are out. It would definitely help in learning Hibernate

re: ADO.NET, Nullable Types, Casting DBNull and You

TheHangedMan — Fri, 31 Oct 2008 03:00:51 GMT

"The cast above is actually failing but casting with "as" doesn't throw an exception and returns a null value which is just what we want."

I used to follow this same approach, but then I noticed that is somewhat dangerous. Imagine the next scenario:

- We have the following table:

CREATE TABLE tab1( column1 INT NULL);

- We have this data-access code:

DateTime? myValue

myValue = row["column1"] as DateTime?;

Notice how the column's type is INT, but we are trying to get a DateTime?. This code would return always null, even if the value of column1 is not! And that's because a value is being returned, but it is the cast which is failing since we are trying to cast from and object whose underlying value is an int to a DateTime?.

Errors like this are not so uncommon, and using this approach we would be possibly letting in some hard-to-debug bugs. I think the use of the "as" casting should be discouraged in this context. It would be better if the code throws an exception so that we soon discover the flaw in the code.

re: Getting Started with NHibernate: Part I

Nick — Sat, 25 Oct 2008 18:08:33 GMT

Where's part 2??

NHibernate Tutorials

Chris May — Tue, 16 Sep 2008 19:17:31 GMT

NHibernate Tutorials

Chris May — Tue, 16 Sep 2008 19:17:27 GMT

NHibernate Tutorials

Chris May — Tue, 16 Sep 2008 19:17:23 GMT

NHibernate Tutorials

Chris May — Tue, 16 Sep 2008 19:17:19 GMT

re: Casting options in C#

lee — Sun, 07 Sep 2008 07:45:09 GMT

There is also another difference that you failed to mention: C style casting works well for reference types AND for value types - while the "as" style ONLY works for reference types

this difference can be crucial when you try to write generic code

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