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The Getting Started window provides several options for starting a new publication, such as the following: If you need help designing the publication layout, you can base the publication on one of the design templates that comes with Publisher. If none of these templates meets your needs, you can download a sample publication from Microsoft Office Online and then customize it. You can also base publications on your own custom templates.

Most of the exceptions that you catch when working with the OLE DB .NET Data Pro; vider are of the OleDbException class. In addition to all the members it has in common with other exception classes, this class exposes the Errors collection that contains one or more OleDbError objects, each one describing how the original error in the database (for example, a violation of the referential integrity rules) has been reported to the many software layers that sit between the database and the application. The following code shows how you can explore the OleDbException.Errors collection to show details about the caught exception:

Run a query that references a table that doesn t exist. Dim cmd As New OleDbCommand( UPDATE xyz SET id=1", cn) Try cmd.ExecuteNonQuery() Catch ex As OleDbException An OleDbException has occurred - display details. Dim msg As String = " For i As Integer = 0 To ex.errors.Count - 1 Dim er As OleDbError = ex.Errors(i) msg &= String.Format( Message = {1}{0}Source = {2}{0} & _ NativeError = {3}{0}SQLState = {4}{0}", ControlChars.CrLf,_ er.Message, er.Source, er.NativeError, er.SQLState) Next MessageBox.Show(msg) Catch ex As Exception MessageBox.Show(ex.Message) A generic exception Finally cn.Close() Close the connection. End Try

The SqlException object also exposes an Errors collection containing one or more SqlError objects. The SqlError object doesn t support the NativeError and SQLState properties but exposes a few members that aren t in OleDbError: Server (the name of the SQL Server that generated the error), Procedure (the name of the stored procedure or remote procedure call that generated the error), LineNumber (the line number within the T-SQL batch or stored procedure where the error occurred), Number (a number that identifies the type of error), and Class (the severity level of the error, in the range 1 through 25). Severity level values in the range 1 through 10 are informational and indicate problems deriving from mistakes in the information the user entered. Values in the range 11 through 16 are caused by the user and can be corrected by the user. Severity levels 17 and higher indicate serious software or hardware errors. In general, errors with severity levels of 20 or higher automatically close the connection. For this reason, you should

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Center Zoom d rectory n the resources for th s chapter uses float ng-po nt va ues to keep track of the s ze and pos t on of the draw rectang e Note that t a so conta ns a float ng-po nt vers on of getPercentage

Dim cn As New OleDbConnection(BiblioConnString)

See Also For information about creating your own templates, see the sidebar titled Custom Templates, later in this chapter.

Dim tr As OleDbTransaction = cn.BeginTransaction(IsolationLevel.Serializable)

Dim cn2 As New SqlConnection(SqlPubsConnString)

Dim tr2 As SqlTransaction = cn2.BeginTransaction(IsolationLevel.Serializable)

You then use the Transaction object to control the outcome of the transaction: you invoke the Commit method to confirm all the changes in the transaction and the Rollback method to cancel them:

It s not uncommon for games and indeed other programs to have problems with the precision of numeric calculations. The float and double data types provided by C# can hold numbers to very high levels of precision, but you need to remember that updates to the variables in games may take place many millions of times a second. Errors in values that build up over time, sometimes called cumulative errors, are something that programmers often need to address.