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As you see in the listing, you define the type of a DataColumn by using a System.Type object. So most of the time you ll use the Visual Basic GetType function for common data types such as String, Integer, and Date. The many remarks explain the several syn tax variations you can adopt when you re adding a new column to the table s schema. Some columns might require that you set additional properties. For example, you should set the AllowDBNull property to False to reject null values, set the Unique prop erty to True to ensure that all values in the column are unique, or set the MaxLength property for String columns. You can create auto-incrementing columns (which are often used as key columns) by setting the AutoIncrement property to True and optionally setting the AutoIncrementSeed and AutoIncrementStep properties, as with the EmpId column in the previous example. You can set the primary key by assigning a DataColumn array to the PrimaryKey prop erty of the DataTable object. In most cases, this array contains just one element, but you can create compound keys made up of multiple columns if necessary:

Create a primary key on the FirstName and LastName columns. dtEmp.PrimaryKey = New DataColumn() _ {dtEmp.Columns( FirstName ), dtEmp.Columns( LastName )}

In this case, a program that implements the delete behavior is provided with two strings, which are the names of two files to be deleted. Because XNA games are usually started from within Windows or directly by the target device, you won t be providing arguments to the Main method, so you can ignore these parameters.

See Also For information about how to move around in dialog boxes such as this one, see Saving and Closing Publications in 1, Getting Started with Publisher 2007.

The DataTable built in the CreateEmployeesTable procedure also contains a calculated column, CompleteName, evaluated as the concatenation of the FirstName and LastName columns. You can assign this expression to the Expression property or pass it as the third argument of the Add method. The Working with Expressions section later in this chapter describes which operators and functions you can use in an expression. Interestingly, you can store any type of object in a DataSet, including forms, controls, and your custom objects. When using a column to store an object, you should specify the col umn type with GetType(Object). If the object is serializable, it will be restored correctly when you write the DataSet to a file and read it back. (If the object isn t serializable, you get an error when you attempt to serialize the DataSet.) Notice that the object state isn t rendered correctly as XML when you issue the WriteXml method, however. (See the Writing XML Data section in 23 for more information about this method.)

The only significant operation that you can perform on an empty DataTable is the addi tion of one or more DataRow objects. The sequence to add a new row is as follows: 1. Use the DataTable s NewRow method to create a DataRow object with the same column schema as the table. 2. Assign values to all the fields in the DataRow (at least, to all fields that aren t nul lable and that don t support a default value). 3. Pass the DataRow to the Add method of the table s Rows collection.

22:

You should ensure that the new row doesn t violate the constraints defined for the table. For example, you must provide a value for all non-nullable columns and set a unique value for the primary key and for all the keys whose Unique property is True. Here s an example that adds a row to the Employees table defined previously. (Notice that it doesn t set the primary key because you ve defined an auto-incrementing column.)

The Program.cs file contains a second use of the keyword using. This is a bit confusing because I ve just described using, but this is a different use of the same keyword. Previously, you saw that using was a directive to the compiler meaning, Look in here if you want to find out about something. Once you get inside the C# program itself, however, the word has a different meaning: Use this object and then dispose of it when you are finished. It s a way of explicitly telling the run-time system how long you need an object. You ve seen that the garbage collector is continuously searching for objects that it can remove from memory. If you want to speed up this process and make sure that an object is disposed of as soon as the program has finished with it, an object should be used within a block of code following a using statement.

8. Navigate to the Documents\Microsoft Press\SBS_Publisher2007\VisualInterest folder,

Dim dtEmp As DataTable = ds.Tables( Employees )

Dim dr As DataRow = dtEmp.NewRow()

dr( FirstName ) = Joe"

dr( LastName ) = Doe"

As an example, consider how you d use a class called HugeObjectUsedForSums in this program:

dr( BirthDate ) = #1/15/1955#

and double-click the Text document. Publisher inserts the contents of the document into the text box.

dr( HomeAddress ) = 1234 A Street"

dr( City ) = Los Angeles"

dr( DeptId ) = 1

dtEmp.Rows.Add(dr)