I have installed Silverlight 4 Toolkit - April 2010. I tried to drop a component in a xaml. But I got an error,
"Unknown namespace http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit". I searched a solution for a while, but no luck at all! Finally, I got the cause I forgot to install Silverlight SDK4! I am so silly!
After I installed it, that works! Please remember set your visual studio project to use Silverlight 4 too!

Getting the row count of a table, that is easy in NHibernate. You can do it this way:

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You can do it this way. That is only getting a row count, just a number! Therefore, a "select count(*)" query is executed.

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I am writing a library management system for church. This is using Spring.Net and NHibnerante. But I faced a problem. After the user updated in a record window, the record in the main window did not get updated. I have read Spring.net Tutorial. That is nothings wrong. Even I forced the session flush. But that did not work. In the session of the record edit window, the fields are updated. When I jumped back to Main Window, the session is updated. Finally, I found the problem in the Transaction attribute. In the DAO, the code should be written like this:

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I was looking for the way to do data validation for my church library management system, there are some good frameworks around. But I found they need to bind with other libraries. After I had spent some time to look around, then I found a library, calls Fluent Validation. They are very simple.
The validation can be done in this way:

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I found the best way to learn a programming is reading example codes. So, I found this website,Microsoft All-In-One Code Framework, is very useful. Roughly, it got hundreds of example codes. THIS IS VERY COOL!