how to generate barcode in c# Framework Fundamentals in Visual C#

Generate Quick Response Code in Visual C# Framework Fundamentals

1
QR Code Generator In Visual C#
Using Barcode maker for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
www.OnBarcode.com
Denso QR Bar Code Reader In C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Framework Fundamentals
Painting Bar Code In C#
Using Barcode encoder for Visual Studio .NET Control to generate, create bar code image in Visual Studio .NET applications.
www.OnBarcode.com
Scanning Barcode In Visual C#.NET
Using Barcode decoder for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Table 1-1
Painting Quick Response Code In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR image in ASP.NET applications.
www.OnBarcode.com
Quick Response Code Creation In VS .NET
Using Barcode generation for .NET framework Control to generate, create QR-Code image in .NET applications.
www.OnBarcode.com
Built-in Value Types
QR-Code Maker In Visual Basic .NET
Using Barcode creation for VS .NET Control to generate, create QR image in Visual Studio .NET applications.
www.OnBarcode.com
Generate UCC - 12 In Visual C#
Using Barcode creator for Visual Studio .NET Control to generate, create UCC - 12 image in .NET applications.
www.OnBarcode.com
Type (Visual Basic/C# alias) System.SByte (SByte/sbyte) System.Byte (Byte/byte) System.Int16 (Short/short) System.Int32 (Integer/int) System.UInt32 (UInteger/uint) System.Int64 (Long/long) System.Single (Single/float) System.Double (Double/double) System.Decimal (Decimal/decimal)
Barcode Creation In C#
Using Barcode generator for Visual Studio .NET Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Code 128C Creator In Visual C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code 128 image in Visual Studio .NET applications.
www.OnBarcode.com
Bytes 1 1 2
Generate Matrix Barcode In C#.NET
Using Barcode generation for VS .NET Control to generate, create Matrix 2D Barcode image in VS .NET applications.
www.OnBarcode.com
Making ANSI/AIM I-2/5 In C#.NET
Using Barcode printer for .NET framework Control to generate, create ANSI/AIM ITF 25 image in .NET framework applications.
www.OnBarcode.com
Range 128 to 127 0 to 255 32768 to 32767
Draw Bar Code In None
Using Barcode creation for Microsoft Excel Control to generate, create barcode image in Office Excel applications.
www.OnBarcode.com
Make ECC200 In None
Using Barcode encoder for Microsoft Excel Control to generate, create ECC200 image in Microsoft Excel applications.
www.OnBarcode.com
Use for Signed byte values Unsigned bytes Interoperation and other specialized uses Whole numbers and counters Positive whole numbers and counters Large whole numbers Floating point numbers Precise or large floating point numbers Financial and scientific calculations requiring great precision
Barcode Creation In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create barcode image in ASP.NET applications.
www.OnBarcode.com
Painting Barcode In Java
Using Barcode creation for Java Control to generate, create bar code image in Java applications.
www.OnBarcode.com
2147483648 to 2147483647 0 to 4294967295
Data Matrix Creation In VB.NET
Using Barcode printer for .NET Control to generate, create ECC200 image in .NET applications.
www.OnBarcode.com
Bar Code Scanner In Visual C#
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET framework applications.
www.OnBarcode.com
8 4 8
EAN 128 Recognizer In Visual C#.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Scanning Bar Code In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
9223372036854775808 to 9223372036854775807 3.402823E+38 to 3.402823E+38 1.79769313486232E+308 to 1.79769313486232E+308 7922816251426433759354 3950335 to 792281625142643375935439 50335
BEST PRACTICES Optimizing performance with built-in types
The runtime optimizes the performance of 32-bit integer types (Int32 and UInt32), so use those types for counters and other frequently accessed integral variables. For floating-point operations, Double is the most efficient type because those operations are optimized by hardware.
Lesson 1: Using Value Types
These numeric types are used so frequently that Visual Basic and C# define aliases for them. Using the alias is equivalent to using the full type name, so most programmers use the shorter aliases. In addition to the numeric types, the non-numeric data types listed in Table 1-2 are also value types.
Table 1-2
Other Value Types
Type (Visual Basic/C# alias) System.Char (Char/char) System.Boolean (Boolean/bool) System.IntPtr (none) System.DateTime (Date/date)
Bytes 2 4 Platformdependent 8
Range N/A N/A N/A 1/1/0001 12:00:00 AM to 12/31/9999 11:59:59 PM
Use for Single Unicode characters True/False values Pointer to a memory address Moments in time
There are nearly 300 more value types in the Framework, but the types shown here cover most needs. When you assign between value-type variables, the data is copied from one variable to the other and stored in two different locations on the stack. This behavior is different from that of reference types, which are discussed in Lesson 2. Even though value types often represent simple values, they still function as objects. In other words, you can call methods on them. In fact, it is common to use the ToString method when displaying values as text. ToString is overridden from the fundamental System.Object type.
NOTE The Object base class
In the .NET Framework, all types are derived from System.Object. That relationship helps establish the common type system used throughout the Framework.
1
Framework Fundamentals
How to Declare Value Types
To use a type, you must first declare a symbol as an instance of that type. Value types have an implicit constructor, so declaring them instantiates the type automatically; you don t have to include the New keyword as you do with classes. The constructor assigns a default value (usually null or 0) to the new instance, but you should always explicitly initialize the variable within the declaration, as shown in the following code block:
NOTE Keyword differences in Visual Basic and C#
One of the cosmetic differences between Visual Basic and C# is that Visual Basic capitalizes keywords, whereas C# uses lowercase keywords. In the text of this book, keywords will always be capitalized for readability. Code samples will always include separate examples for Visual Basic and C#.
' VB Dim b As Boolean = False // C# bool b = false;
NOTE Variable capitalizations in Visual Basic and C#
C# is case-sensitive, but Visual Basic is not case-sensitive. Traditionally, variable names begin with a lowercase letter in C# and are capitalized in Visual Basic. For consistency between the languages, this book will use lowercase variable names for most Visual Basic examples. Feel free to capitalize Visual Basic variables in your own code it will not affect how the runtime processes your code.
Declare the variable as nullable if you want to be able to determine whether a value has not been assigned. For example, if you are storing data from a yes/no question on a form and the user did not answer the question, you should store a null value. The following code allows a Boolean variable to be true, false, or other:
' VB Dim b As Nullable(Of Boolean) = Nothing // C# Nullable<bool> b = null; // Shorthand notation, only for C# bool b = null;
Copyright © OnBarcode.com . All rights reserved.