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Thanks to the groups defined in the regular expression, you can then reference each field by its name when you create the array of values. Be aware that the LoadDataRow method adds a new row only if the key field isn t already in the table. If you re passing the primary key as a value and the table already contains a record with that key, the LoadDataRow method replaces the existing row with the new values. (This is the same behavior that you have when filling the DataTable with data coming from a database via a DataAdapter.) For this reason, it s impor tant that you correctly set the DataTable s primary key to avoid duplicate keys. The BeginLoadData and EndLoadData methods are also useful for performing changes in a DataTable that would result in a temporary violation of the referential integrity rules or other constraints such as the uniqueness of a column for example, when you have to exchange the primary keys of two rows in a table.

static void Main(string[] args) { using (Game1 game = new Game1()) { game.Run(); } }

One important difference between an ADO disconnected Recordset and a DataTable is that the latter doesn t support the concept of navigation through its rows. This happens because a DataTable is a collection of DataRow objects and you can access any ele ment by its index. For example, the following loop converts the FirstName and LastName columns to uppercase in the first 10 records of the Employees table:

For i As Integer = 0 To 9 Dim dr As DataRow = dtEmp.Rows(i) dr( FirstName ) = dr( FirstName ).ToString.ToUpper dr( LastName ) = dr( LastName ).ToString.ToUpper Next

See Also For information about using font schemes, see Choosing a Font Scheme in 4, Marketing Your Product, Service, or Organization and Solving Organization Problems in 5, Creating Text-Based Publications.

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You can also avoid the temporary DataRow object, as in this code snippet:

Clear the name fields of all the records in the DataTable. For i As Integer = 0 To dtEmp.Rows.Count - 1 dtEmp.Rows(i)( FirstName ) = " dtEmp.Rows(i)( LastName ) = " Next

The designers of XNA wanted to make sure that the instance of the game class created to run the game is destroyed as soon as it s no longer needed, so they place it within a block of code after a using statement. The Run method runs your game. When Run is called, it calls the Initialize and LoadContent methods and then repeatedly calls the Update and Draw methods. When the game finishes, the Run method ends, the game class is destroyed, and the program finishes.

You can also use a For Each loop when looping over all the DataRow items in a DataTable:

the font size to 12 points. If the font is too big, you can click the Decrease Font Size button. You can select a speci c point size by clicking the Font Size arrow and clicking the size in the list.

Deleting a row is as easy as issuing a Delete method on the corresponding DataRow object:

Delete the last DataRow in the table. (Can be undeleted.) dtEmp.Rows(dtEmp.Rows.Count - 1).Delete

Deleted rows aren t physically deleted from the DataSet. In fact, the only effect of the Delete method is to mark the row as deleted the row is still in the DataTable, even though you can perform only a small number of operations on it. You can detect whether a row is deleted by means of the RowState property, which is described in the following section. The Rows collection supports the Remove method, which removes the DataRow from the collection. Unlike the DataRow s Delete method, the row is immediately removed from the DataSet and not just marked for deletion:

Later versions of games might have other inputs and outputs, too; for example, if you are playing on Xbox Live, your console is receiving information about other players in your networked game. For now, start by considering only the output from your game. In 3, Getting Player Input, you ll take a look at where the input values come from.

Remove the last DataRow in the table. (Can t be undeleted.) dtEmp.Rows.Remove(dtEmp.Rows.Count 1)