inheritance in vb net with example

Recently read the code or write code, often the VB and C # Basic grammar mixed, for the convenience of viewing, a comparison of its similarities and differences:Initialization of variablesVB.net automatically initializes all the variables to 0 or nothing. C # You are not allowed to use the variables until you initialize the variables.Select parameters (Optional parameters)C # does not provide a function selection parameter, but can still use overloade

. Such as:2. Import the Object library (in VB, for example) in your code.1) Add the Imports statement at the front of the code:Imports ProductstructuretypelibImports MecmodImports PARTITFImports Hybridshapetypelib2) Defining CATIA ObjectsOn Error Resume NextDim CATIA as INFITF. ApplicationCATIA = GetObject (, "CATIA. Application ")If Err.Number CATIA = CreateObject ("CATIA. Application ")Catia. Visible = Tr

project> right-click and choose Properties> Generate tab> Register com InterOP, in this way, the COM component is automatically registered when the project is created. After the project is generated, you can call COM. Here, we use VB as an example to create an EXE project and add references to comlib. TLB. Some files are in the bin directory. Then use the following code to call Option explicit pri

Vb. The Division operators in net have two:/(floating-point division), \ (integer division)The division operator in C # has only one:/(Division)Vb. The division operator in net differs greatly from the division operator in C # , and is differentiated when used.Introduction to the division operator in vb.net (from MSDN)

an empty address.Dim TMP as string = nothing In addition to using "=" for judgment, variables of the reference type can also be judged by "is. "=" Is used to compare whether the content of two objects is the same; "is" is used to compare whether two references point to the same object. The following example proves this:Dim str1 as string = "tmp" Nullable type To make a variable of the value type have the feature of the reference type, we can use the

Const snd_filename as Integer = h20000 Const Snd_alias as Integer = h10000 Const Snd_sync as Integer = h0 There are many more constants, not one list, the following is the example of playing a WAV file Dim mstrfilename as String = "C:\eagle2.wav" PlaySound (mstrfilename, 0, Snd_filename) Note that the above playback is not synchronized, that is, it will not be finished playing. If you write the above code in a Button.Click event handler, i

VB. NET journey-login to a three-tier architecture Initial contact Layer 3 Layer 3 refers to the display layer, business logic layer, and data access layer, which are used for "High Cohesion and low coupling" services. In addition to the above three layers, an entity layer must be included in a program. In my understanding, the entity layer is opposite to the table in the database, the attribute of an ob

Data center billing system for VB. NET --- Report A report is a report form. Simply put, a report dynamically displays data in tables, charts, and other formats. It can be expressed: "Report = diverse formats + Dynamic Data ". Before computers do, people use paper and pen to record data. For example, the bean curd account that people often say is to record the be

In the C/S stage, we learned software engineering, UML, and VB. net, the design model, three-tier architecture, and a simple understanding of the C # language basics. With the accumulation of these theories, we began to use the data room charging system for practice, only by practicing this knowledge can you become a real person, because you can understand it deeply only when you are a real person. The ind

file. Close () End Try End Sub This example is in D Drive to find a readme.txt document. Assuming we do not have this document set up in the D Drive, we run a Catch statement that pops up the source and cause of the error: watermark/2/text/ahr0cdovl2jsb2cuy3nkbi5uzxqvdtaxmduzotm1mg==/font/5a6l5l2t/fontsize/400/fill/i0jbqkfcma==/ Dissolve/70/gravity/southeast ">Let's say we're D disk to create a Readm E.txt documentation. Then there will be

Programming with previous bindings Visual Basic 6.0 and Visual Basic.NET both support deferred binding of objects. The method defines a variable to be an object data type beforehand and then sets it to a class at run time. However, during the upgrade process, you may have an error accessing the default properties of the deferred bound object. For example, suppose the project contains a label object named Label1 in the Form1,form1, and the following Vi