In this tutorial, I show you how to write a program using VB.NET and ASP.NET to ask the user to give a number and then the program will check if the given number is a prime number or not.
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Program Listing
Default.aspx.vb
Public Class _Default
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Dim a As Integer
a = Val(txtNumber.Text)
Dim N, D As Single
Dim tag As String
N = Val(TxtNumber.Text)
Select Case N
Case Is < 2
Label1.Text = "The given number " & N & " is not a prime number."
Case Is = 2
Label1.Text = "The given number " & N & " is a prime number."
Case Is > 2
D = 2
Do
If N / D = Int(N / D) Then
Label1.Text = "The given number " & N & " is not a prime number."
tag = "Not Prime"
Exit Do
End If
D = D + 1
Loop While D <= N - 1
If tag <> "Not Prime" Then
Label1.Text = "The given number " & N & " is a prime number."
End If
End Select
End Sub
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button2.Click
txtNumber.Text = ""
Label1.Text = ""
txtNumber.Focus()
End Sub
End Class
Default.aspx
<%@ Page Title="Addition of Two Numbers Using ASP.NET" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false"
CodeBehind="Default.aspx.vb" Inherits="demo._Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
<style type="text/css">
.style1
{
font-size: medium;
}
.style2
{
font-family: Arial, Helvetica, sans-serif;
font-size: medium;
}
</style>
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<h2 class="style2">
C<strong>reated By Mr. Jake R. Pomperada, MAED-IT, MIT</strong></h2>
<p class="style1">
<strong>Enter first value
<asp:TextBox ID="txtNumber" runat="server"
style="font-size: medium; font-family: Arial, Helvetica, sans-serif"></asp:TextBox>
</strong>
</p>
<p class="style1">
<strong> <asp:Label ID="Label1" runat="server"></asp:Label>
</strong>
</p>
<p class="style1">
<strong>
</strong>
<asp:Button ID="Button1" runat="server" Font-Bold="True" Height="29px"
style="font-size: medium; text-align: center" Text="Check" Width="63px"
ToolTip="Click here to check if the given number is prime number or not." />
<asp:Button ID="Button2" runat="server" Font-Bold="True" Height="29px"
style="font-size: medium; text-align: center" Text="Clear" Width="63px"
ToolTip="Click here to clear the text box." />
</p>
<p class="style1">
</p>
<p>
</p>
</asp:Content>
