Learn console application In Dot net | Vb.net | Asp. Net | framework

Console Application
A console application is a computer program designed to be used via a text-only computer interface, such as a text terminal, the command line interface of some operating systems (Unix, DOS, etc.) or the text-based interface included with some Graphical User Interface (GUI) operating systems, such as the Win32 console in Microsoft Windows. A user typically interacts with a console application using only a keyboard and display screen, as opposed to GUI applications, which normally require the use of a mouse or other pointing device. Many console applications are command line tools, but numerous Text User Interface (TUI) programs also exist.

A console application does not make use of the visual interface capabilities of the Windows operating system. It runs at the DOS prompt, or command window, and its interactions with the user are limited to text input and output.
Console Applications can be developed using VB .NET or C# .NET
VB .NET
Visual Basic .NET (or VB .NET) is a version of Microsoft's Visual Basic that was designed, as part of the company's .NET product group, to make Windows and Web applications easier to develop. According to Microsoft, VB .NET was reengineered, rather than released as VB 6.0 with added features, to facilitate making fundamental changes to the language. VB.NET is the first fully object-oriented programming (OOP) version of Visual Basic, and as such, supports OOP concepts such as abstraction, encapsulation, inheritance and polymorphism.
Example of a simple Vb.Net Console Application.
Module Module1
Sub Main()
Console.WriteLine("Hello World"
End Sub
End Module

ASP .NET
• Asp.NET is mainly used to develop web based applications
• ASP.NET is a server side scripting technology that enables scripts to be executed by an Internet server.
• Server side applications are those which are created and executed within the server. Client side applications are those which are created and executed within the browsers of the client machines.
• ASP.NET is a Microsoft Technology
• ASP stands for Active Server Pages
• ASP.NET is a program that runs inside IIS
• IIS (Internet Information Services) is Microsoft’s Internet server. (Formally called Internet Information Server).This IIS stores all the web apps/pages as virtual directory.
• We can design the asp.net web application by using VS.net.
• There are following ways of creating web application using vs .net.
1. We can create it as HTTP,so that the application can be saved as virtual directory within IIS server.
2. We can create and store it as file system within any logical drive.
3. Two pages are created by default
a. Default.aspx
b. Web.config
• Web.config is a secured file which cannot be accessed in browsers.
• Web.config file is mainly required to give some application settings.
• ASP.net web pages are mainly designed by using various web controls.
ASP.NET Web Controls:-
• Basic Controls (e.g.<asp:Button1>,<asp:Label1>,<asp:DropdownList1>etc)
• HTML Controls (e.g.<input label1>
• Data Controls
• Rich Controls
• Ajax Controls
• Login Controls
• Validation Controls
Asp.Net controls are known as POSTBACK Controls
POSTBACK:-Every time page is displayed, on click it sends back the request again back to the server.
Button,Textbox,Calender are also some of the default postback true controls.
In Asp.net whenever the postback from any asp.net control,by default the page_load() is
executed.
Example: (C# code)
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Write(DateTime.Now.ToString());
}
}

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