How to create a constant in VB.NET?

You use the Const statement to declare a constant and set its value. See below example.

Public Const DaysInYear = 365
Private Const WorkDays = 250

You use the Const statement to declare a constant and set its value. By declaring a constant, you assign a meaningful name to a value. Once a constant is declared, it cannot be modified or assigned a new value. You declare a constant within a procedure or in the declarations section of a module, class, or structure.

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What is TRACE in VB.Net? The tracing is the help in your application for debugging and bug fixing. Trace produces messages about program conditions even after application is compiled and released without interrupting application execution.

The Trace: The trace class is the same class of debugging in .net framework the trace support in an application. The tracing is the help in your application for debugging and bug fixing.

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What is the purpose of Ansi keyword in VB.NET?

Ansi keyword specifies that Visual Basic should marshal all strings to American National Standards Institute (ANSI) values regardless of the name of the external procedure being declared.

Specifies that Visual Basic should marshal all strings to American National Standards Institute (ANSI) values regardless of the name of the external procedure being declared.

When you call a procedure defined outside your project, the Visual Basic compiler does not have access to the information it needs to call the procedure correctly.

This information includes where the procedure is located, how it is identified, its calling sequence and return type, and the string character set it uses. The Declare Statement creates a reference to an external procedure and supplies this necessary information.

The charsetmodifier part in the Declare statement supplies the character set information for marshaling strings during a call to the external procedure.

It also affects how Visual Basic searches the external file for the external procedure name.

The Ansi modifier specifies that Visual Basic should marshal all strings to ANSI values and should look up the procedure without modifying its name during the search.

If no character set modifier is specified, Ansi is the default.

Remarks

The Ansi modifier can be used in this context:

Declare Statement

What is the use of New Keyword in VB.NET? New Keyword is to create a new object instance, specifies a constructor constraint on a type parameter, or identifies a Sub procedure as a class constructor. You can use a New clause in a declaration statement or an assignment statement. When the statement runs, it calls the appropriate constructor of the specified class, passing any arguments you have supplied.

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What is the main method of a VB.NET program?

Public Sub Main() indicates the entry point of VB.Net program.

Every Visual Basic application must contain a procedure called Main. This procedure serves as the starting point and overall control for your application. The .NET Framework calls your Main procedure when it has loaded your application and is ready to pass control to it. Unless you are creating a Windows Forms application, you must write the Main procedure for applications that run on their own.

Main contains the code that runs first. In Main, you can determine which form is to be loaded first when the program starts, find out if a copy of your application is already running on the system, establish a set of variables for your application, or open a database that the application requires.

Requirements for the Main Procedure

A file that runs on its own (usually with extension .exe) must contain a Main procedure. A library (for example with extension .dll) does not run on its own and does not require a Main procedure. The requirements for the different types of projects you can create are as follows:

• Console applications run on their own, and you must supply at least one Main procedure. .
• Windows Forms applications run on their own. However, the Visual Basic compiler automatically generates a Main procedure in such an application, and you do not need to write one.

• Class libraries do not require a Main procedure. These include Windows Control Libraries and Web Control Libraries. Web applications are deployed as class libraries.

Declaring the Main Procedure

There are four ways to declare the Main procedure. It can take arguments or not, and it can return a value or not.

If you declare Main in a class, you must use the Shared keyword. In a module, Main does not need to be Shared.

• The simplest way is to declare a Sub procedure that does not take arguments or return a value.

Module mainModule
     Sub Main()
          MsgBox("The Main procedure is starting the application.")
         ' Insert call to appropriate starting place in your code.
          MsgBox("The application is terminating.")
     End Sub
End Module

• Main can also return an Integer value, which the operating system uses as the exit code for your program. Other programs can test this code by examining the Windows ERRORLEVEL value. To return an exit code, you must declare Main as a Function procedure instead of a Sub procedure.

Module mainModule
     Function Main() As Integer
          MsgBox("The Main procedure is starting the application.")
          Dim returnValue As Integer = 0
          ' Insert call to appropriate starting place in your code.
          ' On return, assign appropriate value to returnValue.
          ' 0 usually means successful completion.
          MsgBox("The application is terminating with error level " &
          CStr(returnValue) & ".")
          Return returnValue
     End Function
End Module

• Main can also take a String array as an argument. Each string in the array contains one of the command-line arguments used to invoke your program. You can take different actions depending on their values.

Module mainModule
     Function Main(ByVal cmdArgs() As String) As Integer
          MsgBox("The Main procedure is starting the application.")
          Dim returnValue As Integer = 0
          ' See if there are any arguments.
          If cmdArgs.Length > 0 Then
               For argNum As Integer = 0 To UBound(cmdArgs, 1)
                    ' Insert code to examine cmdArgs(argNum) and take
                    ' appropriate action based on its value.
               Next argNum
          End If
          ' Insert call to appropriate starting place in your code.
          ' On return, assign appropriate value to returnValue.
          ' 0 usually means successful completion.
          MsgBox("The application is terminating with error level " &
          CStr(returnValue) & ".")
          Return returnValue
     End Function
End Module

• You can declare Main to examine the command-line arguments but not return an exit code, as follows.

Module mainModule
     Sub Main(ByVal cmdArgs() As String)
          MsgBox("The Main procedure is starting the application.")
          Dim returnValue As Integer = 0
          
          ' See if there are any arguments.
          If cmdArgs.Length > 0 Then
               For argNum As Integer = 0 To UBound(cmdArgs, 1)
                    ' Insert code to examine cmdArgs(argNum) and take
                    ' appropriate action based on its value.
               Next argNum
          End If
          
          ' Insert call to appropriate starting place in your code.
          MsgBox("The application is terminating.")
     End Sub
End Module

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What is the default value for Boolean variable in VB.NET? 

Holds values that can be only True or False. The keywords True and False correspond to the two states of Boolean variables. The default boolean value is False in VB.Net

Remarks

Use the Boolean Data Type (Visual Basic) to contain two-state values such as true/false, yes/no, or on/off.

The default value of Boolean is False.

Boolean values are not stored as numbers, and the stored values are not intended to be equivalent to numbers. You should never write code that relies on equivalent numeric values for True and False. Whenever possible, you should restrict usage of Boolean variables to the logical values for which they are designed.

Type Conversions

When Visual Basic converts numeric data type values to Boolean, 0 becomes False and all other values become True. When Visual Basic converts Boolean values to numeric types, Falsebecomes 0 and True becomes -1.

When you convert between Boolean values and numeric data types, keep in mind that the .NET Framework conversion methods do not always produce the same results as the Visual Basic conversion keywords. This is because the Visual Basic conversion retains behavior compatible with previous versions.

Programming Tips

• Negative Numbers. Boolean is not a numeric type and cannot represent a negative value. In any case, you should not use Boolean to hold numeric values.

• Type Characters. Boolean has no literal type character or identifier type character.

• Framework Type. The corresponding type in the .NET Framework is the System.Boolean structure.

Example

In the following example, runningVB is a Boolean variable, which stores a simple yes/no setting.

Dim runningVB As Boolean  
' Check to see if program is running on Visual Basic engine.  
If scriptEngine = "VB" Then  
    runningVB = True  
End If

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What is the difference between C# and VB.NET?

VB.NET was created in order to make Visual Basic 6 developers transition to .NET easier. Under the covers, not much differences. Both C# and VB.NET are compiled into the same Common Intermediate Language, which is then complied into machine code. They share the same runtime engine (for memory management etc.) and libraries.

Differences Between C# vs VB.Net

C# is a general and modern object-oriented programming (OOP) language provided by Microsoft that runs on .Net Framework. C# is pronounced as “C-Sharp”. C# is one of the programming languages designed and referred to as Common Language Infrastructure (CLI) language.

By using the C# programming language, different types of secured and robust applications can be developed. Some of the applications are listed below:

• Window applications.
• Web applications and Web service applications.
• Distributed applications.
• Database applications, etc.

C# programming language is developed by software giant Microsoft in the year 2000 and it is the C family. And C# is certified as a standard programming language by ECMA and ISO.

C# is specially designed and developed to work with Microsoft’s.Net platform. The main aim of designing C# programming language is to provide the information exchange and services as well over the Web service and also to enable developers to build robust portable applications.

C# simplifies way of programming by making use of XML (Extensible Markup Language) and also Simple Object Access Protocol (SOAP), by which programmer need not write additional code for each step. C# is expected to make it run faster to get new products with good quality and stable services to the market.

VB.NET is pronounced as Visual Basic.Net and it is an object-oriented programming language which is implemented on .NET Framework by Microsoft.  VB.NET is an update for classic Visual Basic language which targets Microsoft .NET Framework. VB.NET and visual basic has a lot of similarities and also have some differences.

VB.NET is one of the most famous and also a productive, stable tool for developing application very quickly like the wide range of Windows, Web, Mobile, and Office applications for which it can be built on the .NET Framework.

The vb.net programming language is developed by software giant Microsoft in the year 2001 and it is implemented the on .Net framework and it has the full access to all the libraries present in the .Net Framework. One of the good features is that VB.Net program can also be able to run on Mono, (which is the open-source alternative to .NET), means it is not only restricted to run under Windows but even Linux or Mac OSX.

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What is the lower bound value of array in VB.NET? The lower bound value of an array in VB.NET is 0 (Zero). All arrays start at element 0 (zero) called the lower bound.

As per the featured image of this FAQ the lower bound value of this and any array in VB.NET is 0 (Zero). And the array element of 0 (Zero) holds the numeric value of 73 in this illustration.

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