c# barcode image generation library CREATING CLASSES in Font

Make Data Matrix ECC200 in Font CREATING CLASSES

CHAPTER 6 CREATING CLASSES
Printing ECC200 In None
Using Barcode generator for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
Make Barcode In None
Using Barcode creation for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Testing the Employee Class
Code-39 Encoder In None
Using Barcode drawer for Font Control to generate, create USS Code 39 image in Font applications.
www.OnBarcode.com
Paint Barcode In None
Using Barcode maker for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
To test the Employee class, follow these steps: 1. Open frmLogin in the code editor and locate the btnLogin click event code.
UPC A Drawer In None
Using Barcode creation for Font Control to generate, create GTIN - 12 image in Font applications.
www.OnBarcode.com
Encode Data Matrix 2d Barcode In None
Using Barcode creator for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
Double-clicking the Login button in the form designer will also bring up the event code in the code Tip
EAN128 Drawer In None
Using Barcode generator for Font Control to generate, create UCC.EAN - 128 image in Font applications.
www.OnBarcode.com
EAN-8 Printer In None
Using Barcode creation for Font Control to generate, create GS1 - 8 image in Font applications.
www.OnBarcode.com
editor.
Making Data Matrix 2d Barcode In Visual Studio .NET
Using Barcode generation for Reporting Service Control to generate, create Data Matrix image in Reporting Service applications.
www.OnBarcode.com
Making DataMatrix In Java
Using Barcode printer for Eclipse BIRT Control to generate, create Data Matrix ECC200 image in BIRT reports applications.
www.OnBarcode.com
2. Declare and instantiate a variable of type Employee called oEmployee: Dim oEmployee As Employee = New Employee() 3. Call the Login method of the oEmployee object, passing in the values of the login name and the password from the text boxes on the form: oEmployee.Login(txtName.Text, txtPassword.Text) 4. Show a message box stating the user s security level retrieved by reading the SecurityLevel property of the oEmployee object: MessageBox.Show ("You have security clearence level " & _ oEmployee.SecurityLevel.ToString) 5. Select File Save All. 6. Select Build Build Solution. Make sure there are no build errors in the Error List window. If there are, fix them, and then rebuild. 7. Select Debug Start to run the project. Test the login form by entering a login name of Smith and a password of js. You should get a message indicating a security level of 2. Try entering your name and a password of pass. You should get a message indicating the login failed. 8. After testing the login procedure, close the form, which, in turn, will stop the debugger.
UPCA Printer In None
Using Barcode creation for Microsoft Word Control to generate, create UCC - 12 image in Office Word applications.
www.OnBarcode.com
Make Code-39 In None
Using Barcode maker for Online Control to generate, create Code 3 of 9 image in Online applications.
www.OnBarcode.com
Using Constructors
Barcode Generation In Java
Using Barcode encoder for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Make Code 128 Code Set A In .NET
Using Barcode encoder for ASP.NET Control to generate, create Code 128C image in ASP.NET applications.
www.OnBarcode.com
In OOP, you use constructors to perform any processing that needs to occur when an object instance of the class becomes instantiated. For example, you could initialize properties of the object instance or establish a database connection. When an object instance of a class is instantiated by client code, a constructor method called New is executed. The following constructor is used in the Employee class to initialize the properties of an object instance of the Employee class. An employee ID is passed in to the constructor to retrieve the values from data storage. Public Sub New(ByVal empID As Integer) _empID = empID 'retrieval of data is hardcoded for testing purposes only
EAN128 Creator In Objective-C
Using Barcode drawer for iPad Control to generate, create EAN128 image in iPad applications.
www.OnBarcode.com
Encode EAN128 In Java
Using Barcode printer for Java Control to generate, create USS-128 image in Java applications.
www.OnBarcode.com
CHAPTER 6 CREATING CLASSES
Barcode Generator In VB.NET
Using Barcode generation for VS .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Painting UCC.EAN - 128 In None
Using Barcode creation for Excel Control to generate, create EAN 128 image in Microsoft Excel applications.
www.OnBarcode.com
If _empID = 1 Then LoginName = "Smith" Password = "js" Department = "IS" FullName = "Jerry Smith" ElseIf _empID = 2 Then LoginName = "Jones" Password = "mj" Department = "HR" FullName = "Mary Jones" Else Throw New Exception("Invalid EmployeeID") End If End Sub
UPC-A Supplement 5 Generation In .NET
Using Barcode generation for Reporting Service Control to generate, create Universal Product Code version A image in Reporting Service applications.
www.OnBarcode.com
Barcode Encoder In Objective-C
Using Barcode drawer for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Using Destructors
Microsoft has incorporated automatic memory management into the CLR in the form of a system garbage collector (GC) class. When an object is created in code, the CLR allocates the memory from the managed heap. The managed heap is a portion of the system s memory reserved for the CLR. Periodically, the GC checks the managed heap for objects that are no longer referenced, and it releases the memory. Although using an automated GC process has many advantages for .NET developers, it has a downside: programmers do not know when an object will be garbage collected. When the GC cleans up an object, it executes a destructor method (in .NET languages, this is the Finalize method) for the object. This is referred to as nondeterministic finalization. Because of the time delay between when an object is no longer referenced and when it gets garbage collected, relying on a destructor to clean up system resources such as database connections may, in some instances, cause performance problems. You could force the collection of an object, thereby forcing the execution of the Finalize method, by calling the Collect method of the GC system class. However, this in itself causes significant processing overhead and a degradation of system performance. To get around these problems, if you need to run cleanup code, Microsoft recommends that you create a custom method that the client code will call when it no longer needs the object reference. The following code implements a custom Dispose method that cleans up resources. A call to the Dispose method is also added to the Finalize method of the class, so that if the client forgets to call the Dispose method, it will be called when an object instance is garbage collected: Public Sub Dispose() 'Clean up code goes here. End Sub Protected Overrides Sub Finalize() Dispose() End Sub
Copyright © OnBarcode.com . All rights reserved.