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ADO.NET datasets and data tables are rather sophisticated objects. How much of this sophistication you typically need is debatable (and ADO.NET 2.0 recognizes this by making data tables more independent of datasets for almost all uses). As we saw in 8, navigating data tables is an iterative process through collections of rows and columns. It sure would be nice to make this not only more convenient but more powerful. It would be nice to use LINQ to Objects to query these collections. Unfortunately, neither DataTable nor DataSet implements either IEnumerable(Of T) or IQueryable(Of T). Fortunately, there s LINQ to DataSet. LINQ to DataSet lets us use the standard query operators and some operators that are specific to datasets and data tables. It treats data tables as enumerations of DataRow objects. It doesn t care how data gets into a dataset. We could use a data adapter, as we did in 8, but since we ve just seen how to use LINQ to SQL, let s use that.

Figure 19-1. LINQ architecture LINQ to Objects deals with in-memory data. Any class that implements the IEnumerable(Of T) interface (in the System.Collections.Generic namespace) can be queried with Standard Query Operators (SQOs).

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If you want to set up your server s hard drive manually, that s perfectly fine, but you need to do some thinking before you start. First, you need to decide if you want to use LVM or traditional partitions only. Once you have made this decision, you need to choose between the different file systems that are available for Linux. I recommend making a small overview like the one in Table 1-1. While making such an overview, don t forget to assign some swap space as well. In Linux, swapping happens to a partition or volume, so you must consider it while setting up your server. In general, there is no need to make your swap space larger than 1 GB, with the exception of servers with special applications such as Oracle. If that is the case for your environment, consult your application documentation to find out what amount of swap space is reasonable for your situation. Table 1-1. Hard Disk Configuration Overview

We ll modify the Module1.vb code in Listing 18-1 to load a data table, then we ll use LINQ to DataSet against the table. 1. Add a LINQ Console Application project named LinqToDataSet to the 18 solution. Rename Program.cs to LinqToDataSet.cs. 2. Replace the code in LinqToDataSet.cs with the code in Listing 18-2.

Once you have made up your mind about the hard disk usage, follow these steps to apply your decision. 1. From the Partition disks interface, select Manual. 2. You now see a screen like the one in Figure 1-15. In this screen, select the hard disk that you want to configure.

<Column(Id:=True)> _ Public customerId As String <Column()> _ Public companyName As String <Column()> _ Public city As String <Column()> _ Public country As String End Class Sub Main(ByVal args As String()) ' Connection string Dim connString As String = _ "server = .\sqlexpress;" _ & "integrated security = true;" _ & "database = northwind" ' Create data context Dim db As DataContext = New DataContext(connString) ' Create typed table Dim customers As Table(Of Customers) = db.GetTable(Of Customers)() ' Create dataset Dim ds As DataSet = New DataSet() ' Load typed table into dataset ds.Tables.Add(customers.ToDataTable()) ' Query data table Dim custs = _ From c In ds.Tables(0).ToQueryable() _ Select _ cid := c.Field(Of String)("customerid"), _ co := c.Field(Of String)("companyname") ObjectDumper.Write(custs) End Sub End Module

s Note SQOs are a collection of methods that form the LINQ pattern. SQO methods operate on sequences,

3. Make it the startup project and run it with Ctrl+F5. You should see the result in Figure 18-14.

3. Because you have just selected an entire hard disk to configure, the installation program warns you, stating that continuing will remove all existing partitions on the hard drive. If you are sure you want to do this, select Yes and press the Enter key. 4. You now see an overview of all available unconfigured disk space on the selected hard drive (see Figure 1-16). Select this free space and press Enter.

where a sequence represents an object whose type implements the interface IEnumerable(Of T) or the interface IQueryable(Of T). The SQO provides query capabilities including filtering, projection, aggregation, sorting, and so forth.

' Create dataset Dim ds As DataSet = New DataSet()

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