Answer:
Introduction:
A class library contains the library of classes, interfaces and value types that provide the access to the certain functionalities. Classes provide the reusable code in form of object.
In the following application we create a class library with function Factorial(), which calculates the factorial of the given number. The name of the class library is “ClassLibraryDemoTest”.
The code is written in Visual Basic.
Default.aspx.vb
Imports ClassLibraryDemoTest
Public Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Private Function Factorial(ByVal n As Integer)
If (n = 0) Then
Factorial = 1
Else
Factorial = n * Factorial(n - 1)
End If
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn.Click
Dim n As Integer
n = Integer.Parse(TextBox1.Text)
Label1.Text = Factorial(n).ToString()
End Sub
End Class
Default.aspx
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="ClassLibraryDemoTest._Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<fieldset style="width:380px; background-color:antiquewhite">
Enter Number: <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="btn" runat ="server" Text="Factorial" OnClick ="Page_Load"/>
<asp:Label ID="Label1" runat="server" Text =""></asp:Label>
</fieldset>
</div>
</form>
</body>
</html>
Output:
1. Factorial of 5
2. Factorial of 6
