Tuples, Anonymous Types, and Concrete Types

I am attemping to do a multiple column group by in linq using VB.  I've followed a code sample i obtained at the following url:

http://msdn.microsoft.com/en-us/vbasic/bb737926.aspx#grpbymult

the sample code is:

GroupBy - Multiple Columns

This sample uses Group By to group products by CategoryID and SupplierID.

Public Sub LinqToSqlGroupBy09()
    Dim categories = From p In db.Products _
                     Group By Key = New With {p.CategoryID, p.SupplierID} Into Group _
                     Select Key, Group

    ObjectDumper.Write(categories, 1)
End Sub

My code result though is not correct, as i am getting duplicates.   The first query is using the data which is stored in a datatable.  The second table pulls the data from a list of objects which i manually built in an effort to get closer to the Example provided above.

Dim listNamesWithSeverity = From myrow As DataRow In dt.Rows _
                

SharePoint content types provide users with a way to manage and organize content in a more meaningful way. It's a reusable of settings you want to apply to a particular type of document in a library or item in a list.

UML provides a number of diagram types as a mechanism for entering model elements into the model and showing overlapping sets of models elements and their relationships. UML does not specify what diagrams should be created or what they should contain, only what they can contain and the rules for connecting the elements. The diagram types include:

Further diagram types include:

Activity Diagrams - a generic flow chart used much in business modelling and sometimes in use case modelling to indicate the overall flow of the use case. This diagram type replaces the need for dataflow diagrams but is not a main diagram type for the purposes of analysis and design.

SharePoint provides some out of the box List Types. Some of the most used ready made list types that SharePoint provides currently are listed below:

In this article I will try to describe the one of the best feature in Microsoft office Share Point 2007 called Content Types.

Content types are simply collection of contents.Each content in a Content type can have different settings.Basically it is a reusable collection of settings which you want to apply to a particular category of contents.

Date and time values can be stored with either the DATETIME or SMALLDATETIME data type. The difference between the two is that SMALLDATETIME supports a smaller range of dates and does not give the same level of precision when accounting for time. The DATETIME data type can hold values from January 1st of 1753 to December 31st of 9999. The time is stored to the 1 three hundredths of a second and each value takes up 8 bytes of storage. The SMALLDATETIME data type can hold values between January 1st 1900 and June 6th of 2079. The time is tracked to the minute and each value takes up 4 bytes of storage. The majority of business applications can live happily with SMALLDATETIME, however, if you are in an environment where each second matters or you need to make estimates to the distant future (or past) then you have to resort to DATETIME. If you fail to specify the time when inserting a value into a DATETIME or SMALLDATETIME column, a default of midnight is used. If you fail to specify the date portion the default of January 1, 1900 is used.

With Windows Presentation Foundation coming closer to its release date with Vista almost being upon us, more and more people are taking a look at programming in WPF

The following sections in this topic provide an overview of all Transact-SQL date and time data types and functions. For information and examples that are common to date and time data types and functions

This is good and precise introduction and Frequently Asked Questions - SQL Server Data Types