barcode printing using c#.net R EMEMBER For clarity, the remaining namespace examples in this chapter show all namespaces in C#.NET

Painting Quick Response Code in C#.NET R EMEMBER For clarity, the remaining namespace examples in this chapter show all namespaces

R EMEMBER For clarity, the remaining namespace examples in this chapter show all namespaces
Encode QR Code In Visual C#
Using Barcode printer for VS .NET Control to generate, create QR Code ISO/IEC18004 image in .NET framework applications.
QR Code Scanner In C#
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET applications.
required by a program within the same file In real-world code, however, a namespace will often be defined in its own file, as the preceding example illustrates
Bar Code Encoder In C#.NET
Using Barcode maker for VS .NET Control to generate, create bar code image in .NET framework applications.
Decoding Barcode In C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Namespaces Prevent Name Conflicts
Create QR Code In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Encode QR Code In .NET
Using Barcode generation for VS .NET Control to generate, create QR Code image in .NET framework applications.
The key point about a namespace is that names declared within it won t conflict with similar names declared outside of it For example, the following program defines two namespaces The first is Counter, shown earlier The second is called Counter2 Both contain classes called CountDown, but because they are in separate namespaces, the two classes do not conflict Also notice how both namespaces are specified within the same file As just explained, a single file can contain multiple namespace declarations Of course, separate files for each namespace could also have been used
QR Code ISO/IEC18004 Generation In Visual Basic .NET
Using Barcode creator for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in VS .NET applications.
ECC200 Encoder In Visual C#
Using Barcode generator for .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications.
// Namespaces prevent name conflicts using System; // Declare the Counter namespace namespace Counter { // A simple countdown counter class CountDown { int val; public CountDown(int n) { val = n; } public void Reset(int n) { val = n; } public int Count() { if(val > 0) return val--; else return 0; } } } // Declare the Counter2 namespace namespace Counter2 { /* This CountDown is in the Counter2 namespace and does not conflict with the one in Counter */ class CountDown { public void Count() { ConsoleWriteLine("This is Count() in the " + "Counter2 namespace"); }
Create Code-39 In C#.NET
Using Barcode generation for .NET framework Control to generate, create Code 39 Extended image in Visual Studio .NET applications.
USS-128 Generation In Visual C#
Using Barcode generator for VS .NET Control to generate, create UCC-128 image in VS .NET applications.
16:
Draw Bar Code In Visual C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
USD-4 Encoder In C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Uniform Symbology Specification Codabar image in .NET framework applications.
N a m e s p a c e s , t h e P r e p r o c e s s o r, a n d A s s e m b l i e s
Make Code 39 Extended In Java
Using Barcode printer for Java Control to generate, create USS Code 39 image in Java applications.
Generating Bar Code In Java
Using Barcode maker for Java Control to generate, create bar code image in Java applications.
PART I
Code 128 Code Set C Drawer In None
Using Barcode creation for Software Control to generate, create USS Code 128 image in Software applications.
Data Matrix Decoder In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
class NSDemo2 { static void Main() { // This is CountDown in the Counter namespace CounterCountDown cd1 = new CounterCountDown(10); // This is CountDown in the Counter2 namespace Counter2CountDown cd2 = new Counter2CountDown(); int i; do { i = cd1Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); cd2Count(); } }
EAN / UCC - 13 Creator In Objective-C
Using Barcode printer for iPhone Control to generate, create EAN / UCC - 13 image in iPhone applications.
Barcode Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
The output is shown here:
GS1 - 12 Creator In None
Using Barcode printer for Font Control to generate, create UPC-A Supplement 5 image in Font applications.
Paint EAN-13 In None
Using Barcode generator for Office Excel Control to generate, create EAN 13 image in Microsoft Excel applications.
10 9 8 7 6 5 4 3 2 1 0 This is Count() in the Counter2 namespace
As the output confirms, the CountDown class inside Counter is separate from the CountDown class in the Counter2 namespace, and no name conflicts arise Although this example is quite simple, it is easy to see how putting classes into a namespace helps prevent name conflicts between your code and code written by others
using
If your program includes frequent references to the members of a namespace, having to specify the namespace each time you need to refer to a member quickly becomes tedious The using directive alleviates this problem Throughout this book, you have been using it to bring the C# System namespace into view, so you are already familiar with it As you would expect, using can also be employed to bring namespaces that you create into view There are two forms of the using directive The first is shown here: using name; Here, name specifies the name of the namespace you want to access This is the form of using that you have already seen All of the members defined within the specified namespace are brought into view and can be used without qualification A using directive must be specified at the top of each file, prior to any other declarations, or at the start of a namespace body The following program reworks the counter example to show how you can employ using to bring a namespace that you create into view:
// Demonstrate the using directive using System;
Part I:
The C# Language
// Bring Counter into view using Counter; // Declare a namespace for counters namespace Counter { // A simple countdown counter class CountDown { int val; public CountDown(int n) { val = n; } public void Reset(int n) { val = n; } public int Count() { if(val > 0) return val--; else return 0; } } } class NSDemo3 { static void Main() { // now, CountDown can be used directly CountDown cd1 = new CountDown(10); int i; do { i = cd1Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); CountDown cd2 = new CountDown(20); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); cd2Reset(4); do { i = cd2Count(); ConsoleWrite(i + " "); } while(i > 0); ConsoleWriteLine(); } }
This version of the program contains two important changes The first is this using statement, near the top of the program:
16:
Copyright © OnBarcode.com . All rights reserved.