In the preceding image, we can see the extension file, now keep the name as it is or change it as you wish, I have kept it as it is because the next time you can easily remember it and click on the add button, now after that your Solution Explorer will look as in the following In the preceding Handler1cs file, first I have created the object of the cs class to use the connection method and variable to avoid the repetition of code because in the cs file we also need the same connection method and string variables that are in the cs class.Now, the most important thing is to specify the image URL property of the image control that display the images from the database, so let us see how to do it.
If an error message is not specified, a default error message is displayed.
Here the term database is a general term; it includes a huge variety of specific databases - excel sheets, text files, sql server, jet database, etc.
In object oriented terminology, ADO is simply an object model that allows us to interact with a database so that we can fetch, add or modify data. This object allows us to establish a connection with a database.
Net basic syntax on the basis of our observations in it: Imports System Public Class Rectangle Private length As Double Private width As Double 'Public methods Public Sub Accept Details() length = 4.5 width = 3.5 End Sub Public Function Get Area() As Double Get Area = length * width End Function Public Sub Display() Console. The type of a variable determines how much space it occupies in storage and how the bit pattern stored is interpreted. Read Key() End Sub End Module Module Data Types Sub Main() Dim n As Integer Dim da As Date Dim bl As Boolean = True n = 1234567 da = Today Console. The syntax for the Enum statement is as follows: Module constants Nenum Enum Colors red = 1 orange = 2 yellow = 3 green = 4 azure = 5 blue = 6 violet = 7 End Enum Sub Main() Console.
Therefore, it has full access to all the libraries in the . NET, not only under Windows, but even Linux or Mac OSX. Net a widely used professional language: In this chapter, we will discuss the tools available for creating VB. Let us now briefly look into what do class, object, methods and instant variables mean. Let us look at an implementation of a Rectangle class and discuss VB. Write Line("Area: ", Get Area()) End Sub Shared Sub Main() Dim r As New Rectangle() r. Instance methods are invoked through an object of the class: Data types refer to an extensive system used for declaring variables or functions of different types. The following table shows all the data types available: Module Data Types Sub Main() Dim b As Byte Dim n As Integer Dim si As Single Dim d As Double Dim da As Date Dim c As Char Dim s As String Dim bl As Boolean b = 1 n = 1234567 si = 0.12345678901234566 d = 0.12345678901234566 da = Today c = "U"c s = "Me" If Script Engine = "VB" Then bl = True Else bl = False End If If bl Then 'the oath taking Console. Write Line("declaring on the day of: ", da) Console. Write Line("The Single: , The Double: ", si, d) End If Console. The Enum statement can be used at the module, class, structure, procedure, or block level.