barcode generator in vb.net 2010 Using the Mouse in Java

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' display rows Dim row As DataRow For Each row In dt.Rows Console.WriteLine("{0} {1} {2}", _ row("firstname").ToString().PadRight(15), _ row("lastname").ToString().PadLeft(25),row("city")) Next row ' insert employees ' ' create command Dim cmd As New SqlCommand(ins, conn) ' ' map parameters cmd.Parameters.Add("@firstname", _ SqlDbType.NVarChar, 10, "firstname") cmd.Parameters.Add("@lastname", _ SqlDbType.NVarChar, 20, "lastname") cmd.Parameters.Add("@titleofcourtesy", _ SqlDbType.NVarChar, 25, "titleofcourtesy") cmd.Parameters.Add("@city", _ SqlDbType.NVarChar, 15, "city") cmd.Parameters.Add("@country", _ SqlDbType.NVarChar, 15, "country") ' ' insert employees da.InsertCommand = cmd da.Update(ds, "employees") Catch e As Exception Console.WriteLine(("Error: " + e.ToString)) Finally ' close connection conn.Close() End Try End Sub End Module 3. Make PersistAdds the startup project, and run it by pressing Ctrl+F5. You should see the results in Figure 13-8.

Advanced .NET Remoting is divided into two parts. Part 1 (s 1 through 10) covers everything you need to know for developing distributed applications within the .NET Framework. Part 2 (s 11 through 15) gives you a thorough technical insight that will allow you to really understand what s happening behind the scenes and how you can tap into customizing the framework to suit your exact needs. Following is a brief chapter-by-chapter summary of the topics covered in this book.

public java.util.Enumeration getResponseContentTypes()

A relational database table is essentially a two-dimensional matrix with rows (records) and columns (fields). A primary key is a column that uniquely identifies each row, and that means you can t store the same value in a primary-key column of any two records (so it s also a unique key). The primary key is usually a single numeric or GUID column, but it can also be composed as a set of columns, in which case it s called a composite primary key. Tables can be linked or related to one another using relationships. To set up a relationship, you need foreign keys, which are columns that store primary key values in a host table. For instance, in a one-toone relationship, a record in table A can be associated with a record in table B by A containing a foreign key to B s primary key column, or vice versa, or both, depending on the navigability of the relationship. A one-to-one relationship is rare because it makes more sense to merge the two tables, unless the foreign key is allowed to be null. On the other hand, one-to-many (1..*) relationships are ubiquitous, allowing 440

</application> </system.runtime.remoting> </configuration> There is just one thing to note: instead of configuring a port number for an IPC channel, it gets a unique name. This name identifies the IPC port (that said, each named pipe port needs its own unique name) and is used by the client to connect to the server as you will see in the client s implementation in Listing 4-8.3 Therefore, the name must be unique at the machine level to avoid conflicts between your application and other applications running on the same machine. In the client application, the IPC channel is manually configured in the source code. Listing 4-8 shows the client s implementation. Listing 4-8. The .NET 2.0 Client Implementation using using using using using using using System; System.Collections.Generic; System.Runtime.Remoting; System.Runtime.Remoting.Channels; System.Runtime.Remoting.Channels.Ipc; System.Runtime.Remoting.Activation; System.Text;

// Did the computer's paddle make contact withthe ball if(CGRectIntersectsRect(ball.frame, compPaddle.frame)) { AudioServicesPlaySystemSound (self.paddleSoundObject); // Reverse front-to-back direction if(ball.center.y > compPaddle.center.y) { ballSpeed.y = -ballSpeed.y; // each time the computer hits the ball, speed it up ballSpeed.y++; } // Let's change the X (side-to-side) direction if we're near the edge of the table if ( (ball.center.x > (self.view.bounds.size.width /2)+100) || (ball.center.x < (self.view.bounds.size.width /2)-100) )

Validation is the case of expected errors being handled, but we also need to take account of the unusual and unanticipated error. As in normal processing, we handle these by using