How to Find Prime Number in Window Store App

In this article I explain how to determine if a specific number is a prime number or not. We all know that a number that can only be divided by one or itself is called a prime number. But implementing in a program the determination of whether a number is prime is not simple. That is why I have written some simple logic for determining prime numbers in an app.

Use the following procedure to create the prime number finder app.

Step 1

First of all you have to create a New Window Store Application, as in:

  • Open Visual Studio 2012
  • "File" -> "New" -> "Project..."
  • Choose Template: "Visual C#" -> "Window Store app"
  • "Blank App (XAML)" then rename the application.


Step 2

Now the project will be opened; go into the Solution Explorer and choose "MainPage.Xaml" designing and "MainPage.Xaml.cs" to write the business logic.


Step 3

Now I have written the simple XAML code In "Mainpage.Xaml"; see:









    <Grid Background="Blue">


            <RowDefinition Height="46*"/>

            <RowDefinition Height="44*"/>

            <RowDefinition Height="37*"/>

            <RowDefinition Height="48*"/>

            <RowDefinition Height="593*"/>



            <ColumnDefinition Width="79*"/>

            <ColumnDefinition Width="188*"/>

            <ColumnDefinition Width="416*"/>


        <TextBlock Text="Check wether Number is Prime or not" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Grid.Column="1" Grid.Row="0" Foreground="Red"  ></TextBlock>

        <TextBlock Text="Enter Number:" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Foreground="Red" Grid.Column="1" Grid.Row="1" ></TextBlock>

        <TextBox x:Name="textbox1" Grid.Column="1" Grid.Row="1" Width="200" Height="32" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="166,0,0,0"/>

        <TextBlock Text="Number is:" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Grid.Column="1" Grid.Row="2" Foreground="Red" ></TextBlock>

        <TextBlock x:Name="text2" FontSize="15" FontFamily="Arial" FontWeight="ExtraBold" Grid.Column="1" Grid.Row="2" Foreground="Red" Margin="166,0,60,0" RenderTransformOrigin="-1.369,0.135" />

        <Button x:Name="Button1" Grid.Column="1" Grid.Row="3" Background="Yellow" Foreground="Red" Width="151" Height="43" Content="Click" FontSize="20" FontWeight="ExtraBold" Margin="165,0,0,0" VerticalAlignment="Top" RenderTransformOrigin="-0.266,-0.119" Click="Button1_Click" />




Step 4

Write the C# code in the "Mainpage.Xaml.cs" page; see:

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using Windows.Foundation;

using Windows.Foundation.Collections;

using Windows.UI.Xaml;

using Windows.UI.Xaml.Controls;

using Windows.UI.Xaml.Controls.Primitives;

using Windows.UI.Xaml.Data;

using Windows.UI.Xaml.Input;

using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
namespace prime_app
public sealed partial class MainPage : Page
public MainPage()
protected override void OnNavigatedTo(NavigationEventArgs e)
private void Button1_Click(object sender, RoutedEventArgs e)
int num = Convert.ToInt32(textbox1.Text);
for (int i = 2; i <= num - 1; i++)
if (num % i == 0)
                    text2.Text =
"Not a Prime Number";
if (i == num - 1)
                    text2.Text =
"Prime Number";
if (num == 1 || num == 2)
                text2.Text =
"Prime Number";


Step 5

Run your application.


Step 6

Now enter a number in the TextBox to determine if the number is prime or not.



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