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To fill a DataSet by hand, you need to follow several steps: 1. First, create the DataSet. 2. Next, create a new DataTable, and add it to the DataSet.Tables collection. 3. Next, define the structure of the table by adding DataColumn objects (one for each field) to the DataTable.Colums collection. 4. Finally, supply the data. You can get a new, blank row that has the same structure as your DataTable by calling the DataTable.NewRow() method. You must then set the data in all its fields, and add the DataRow to the DataTable.Rows collection. Here s how the code unfolds: ' Define a DataSet with a single DataTable. Dim dsInternal As New DataSet() dsInternal.Tables.Add("Users") ' Define two columns for this table. dsInternal.Tables("Users").Columns.Add("Name") dsInternal.Tables("Users").Columns.Add("Country") ' Add some actual information into the table. Dim rowNew As DataRow = dsInternal.Tables("Users").NewRow() rowNew("Name") = "John" rowNew("Country") = "Uganda" dsInternal.Tables("Users").Rows.Add(rowNew) rowNew = dsInternal.Tables("Users").NewRow() rowNew("Name") = "Samantha" rowNew("Country") = "Belgium" dsInternal.Tables("Users").Rows.Add(rowNew) rowNew = dsInternal.Tables("Users").NewRow() rowNew("Name") = "Rico" rowNew("Country") = "Japan" dsInternal.Tables("Users").Rows.Add(rowNew) Next, you bind the DataTable from the DataSet to the appropriate control. Because list controls can only show a single column at a time, you also need to choose the field you want to display for each item by setting the DataTextField property: ' Define the binding. lstUser.DataSource = dsInternal.Tables("Users") lstUser.DataTextField = "Name" Alternatively, you could use the entire DataSet for the data source, instead of just the appropriate table. In that case, you would have to select a table by setting the control s DataMember property. This is an equivalent approach, but the code is slightly different:

' Define the binding. lstUser.DataSource = dsInternal lstUser.DataMember = "Users" lstUser.DataTextField = "Name" As always, the last step is to activate the binding: Me.DataBind() The final result is a list with the information from the specified database field, as shown in Figure 16-8. The list box will have an entry for every single record in the table, even if it appears more than once, from the first row to the last.

For the RSS extension, the router will look to the app/layouts/rss directory to find the default RSS layout. Create the default.ctp layout file, and place it in this directory. Paste into this new file the contents of Listing 10-2. Listing 10-2. The File Contents of app/layouts/rss/default.ctp < =$rss->document(null,$content_for_layout); > With the help of the built-in $rss->document() function, you don t have to worry about knowing the format of a standard RSS file. In the event that you use a file type not included in Cake s helpers, you would have to supply the proper headers yourself; of course, this will depend on the appropriate syntax and specifications of the file type in question.

Tip The simple list controls require you to bind their Text or Value property to a single data field in the data

3. In the Constraint box, type a number, a cell reference, or a formula (if you selected an operator other than Int or Bin). 4. Click the OK button to accept the constraint and return to the Solver Parameters dialog box, or click the Add button to accept the constraint and prepare to add another constraint without returning to the Solver Parameters dialog box first. You can also click the Cancel button to cancel the constraint entry and return to the Solver Parameters dialog box. To change an existing constraint, click the Solver Parameters dialog box s Change button. The Change Constraint dialog box appears. This dialog box looks identical to the Add Constraint dialog box. Here, you can modify the cell reference, operator, and/or constraint value, using the same procedure as described in the previous steps for adding a constraint.

source object. However, much more flexibility is provided by the more advanced data binding controls examined in the next chapter. They allow fields to be combined in just about any way you can imagine.

The next example is more practical. It s a good example of how you might use data binding in a full ASP.NET application. This example allows the user to select a record and update one piece of information by using data-bound list controls. The first step is to add the connection string to your web.config file. This example uses the Products table from the Northwind database included with many versions of SQL Server. Here s how you can define the connection string for SQL Server Express: <configuration> <connectionStrings> <add name="Northwind" connectionString=