Prime Number Checker Using ASP.NET

 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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <asp:TextBox ID="txtNumber" runat="server" 

            style="font-size: medium; font-family: Arial, Helvetica, sans-serif"></asp:TextBox>

        </strong>

    </p>

    <p class="style1">

        <strong>&nbsp;<asp:Label ID="Label1" runat="server"></asp:Label>

        &nbsp;&nbsp;

        </strong>

    </p>

    <p class="style1">

        <strong>&nbsp;&nbsp; &nbsp;&nbsp;

        </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." />

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

        <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">

        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;</p>

    <p>

        &nbsp;</p>

</asp:Content>