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Data Public Class Main Class Shared Sub Main() Dim ds Users As New Data Set() dtm Users.

Add(dcm Last Name) ' Activate the mapping mechanism da Users.

As you saw in the Data Table, Data Row, and Data Column sections at the beginning of this article, you can use the Delete method of a Data Row to delete a row.

The Add New method of the Data Table adds a row to a Data Table.

For example, the following call to Update writes changes from the Data Table named Categories back to the SQL Server table of the same name: statement that was provided to the Sql Data Adapter object or can be explicitly provided to the Sql Data Adapter object. When the Update method is called, the Sql Data Adapter object notes that no values have been set for its Update Command, Insert Command, and Delete Command prperties, and therefore queries the Sql Command Builder object for these commands. row("Description") = "Milk and stuff" ' Perform the update. Update(ds, "Categories") ' Close the database connection.

Example 8-2 shows an example of allowing an Sql Data Adapter object to infer the SQL ' Open a database connection. If any of these properties had been set on the Sql Data Adapter object, those values would have been used instead.

Bind variables are placeholders inside a SQL statement.

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Dim str Connection As String = _ "Data Source=localhost; Initial Catalog=Northwind;" _ & "Integrated Security=True" Dim cn As Sql Connection = New Sql Connection(str Connection) cn. Dim da As Sql Data Adapter = New Sql Data Adapter("SELECT * FROM Categories", cn) ' Create an UPDATE command. ' Note the parameter names: @Description and @Category ID.

To change an existing row's data, you can directly assign a row's value. Delete() In this example, I'll show you how to add edit, and remove, data from the Northwind database.

To save data to the data source, you need to call the Data Adapter's Update method. I'll display the result of the Customers table in a Data Grid after adding, updating, and deleting data from the table.

Dim str Select As String = _ "SELECT * FROM Categories" Dim da As Sql Data Adapter = New Sql Data Adapter(str Select, cn) ' Set the data adapter object's UPDATE, INSERT, and DELETE ' commands. Select("Category Name = 'Dairy Products'")(0) row("Description") = "Milk and stuff" ' Add a record. New Row( ) row("Category Name") = "Software" row("Description") = "Fine code and binaries" dt. For each row that is to be changed, added, or deleted, the parameters are replaced with values from the row, and the resulting SQL statement is issued to the database.

Use the Sql Command Builder class's ability to auto- ' generate these commands from the SELECT command. The choice of which value from the row to use for which parameter is controlled by the Sql Command object's Parameters property.