Login and registration process in WPF application

Introduction

In this article, I am creating a simple application for login and registration using WPF in Visual Studio 2010. In this application, I am creating two window forms one is for Registration and another is for login. First of all user will register after then he/she can login.

Now I am going to discuss in brief about this application.

Step 1. Open Visual Studio 2010 -> File -> New -> Project.

The new project template will display and select WPF Applications as follows.

WPF Applications

Figure 1

Step 2. Enter your project name and click on the OK button.

Step 3. You will get the MainWindow.xaml window form, if you want to change then rename it and also change the StartupUri property of the application into App.xaml like as follows.

App. xaml

<Application x:Class="Login_WPF.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="Registration.xaml">
    <Application.Resources>
    </Application.Resources>
</Application>

Step 4. Now design your Registration page as Figure 2 or copy and page following the inline code.

Registration.xaml

<Window x:Class="Login_WPF.Registration"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Registration" Height="387" Width="528" Background="Black">
    <Grid Height="350" Width="525" Background="Bisque">
        <TextBlock Height="23" HorizontalAlignment="Left" Margin="10,5,0,0"
                   Name="textBlockHeading" Text="Registration:" VerticalAlignment="Top"
                   Width="110" FontSize="17" FontStretch="ExtraCondensed"/>
        
        <!-- Button as a Link button using style -->
        <Button Margin="451,5,12,288" Content="Login" Cursor="Hand" Click="Login_Click">
            <Button.Template>
                <ControlTemplate TargetType="Button">
                    <TextBlock TextDecorations="Underline">
                        <ContentPresenter/>
                    </TextBlock>
                </ControlTemplate>
            </Button.Template>
            <Button.Style>
                <Style TargetType="Button">
                    <Setter Property="Foreground" Value="Navy"/>
                    <Style.Triggers>
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter Property="Foreground" Value="Red"/>
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
        </Button>
        <!-- End Button as a Link button using style -->
        
        <Grid Margin="31,0,29,23" Background="White" Height="264" VerticalAlignment="Bottom">
            <Grid.RowDefinitions>
                <RowDefinition Height="252*"/>
                <!-- <RowDefinition Height="12*"/> -->
            </Grid.RowDefinitions>           
            <TextBlock Height="20" HorizontalAlignment="Left" Margin="67,0,0,0"
                       x:Name="errormessage" VerticalAlignment="Top" Width="247"
                       OpacityMask="Crimson" Foreground="#FFE5572C"/>          
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="67,20,0,0"
                       Name="textBlockFirstname" Text="First Name:" VerticalAlignment="Top"
                       Width="110"/>           
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="67,50,0,0"
                       Name="textBlockLastName" Text="Last Name:" VerticalAlignment="Top"
                       Width="110"/>           
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="67,80,0,0"
                       Name="textBlockEmailId" Text="EmailId" VerticalAlignment="Top"
                       Width="110"/>            
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="67,107,0,0"
                       Name="textBlockPassword" Text="Password:" VerticalAlignment="Top"
                       Width="110"/>          
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="67,136,0,0"
                       Name="textBlockConfirmPwd" Text="ConfirmPassword:" VerticalAlignment="Top"
                       Width="110" Grid.RowSpan="2"/>          
            <TextBlock Height="23" HorizontalAlignment="Left" Margin="67,166,0,0"
                       Name="textBlockAddress" Text="Address" VerticalAlignment="Top"
                       Width="110"/>            
            <TextBox Height="23" HorizontalAlignment="Left" Margin="183,20,0,0"
                     Name="textBoxFirstName" VerticalAlignment="Top" Width="222"/>           
            <TextBox Height="23" HorizontalAlignment="Left" Margin="183,50,0,0"
                     Name="textBoxLastName" VerticalAlignment="Top" Width="222"/>         
            <TextBox Height="23" HorizontalAlignment="Left" Margin="183,80,0,0"
                     Name="textBoxEmail" VerticalAlignment="Top" Width="222"/>            
            <PasswordBox Height="23" HorizontalAlignment="Left" Margin="183,107,0,0"
                         Name="passwordBox1" VerticalAlignment="Top" Width="222"/>           
            <!-- For password -->
            <PasswordBox Height="23" HorizontalAlignment="Left" Margin="183,136,0,0"
                         Name="passwordBoxConfirm" VerticalAlignment="Top" Width="222"/>          
            <TextBox Height="23" HorizontalAlignment="Left" Margin="183,0,0,66"
                     Name="textBoxAddress" VerticalAlignment="Bottom" Width="222"/>         
            <Button Content="Submit" Height="23" HorizontalAlignment="Left" Margin="183,204,0,0"
                    Name="Submit" VerticalAlignment="Top" Width="70" Click="Submit_Click"/>       
            <Button Content="Reset" Height="23" HorizontalAlignment="Left" Margin="259,204,0,0"
                    Name="button2" VerticalAlignment="Top" Width="70" Click="button2_Click"/>       
            <Button Content="Cancel" Height="23" HorizontalAlignment="Right" Margin="0,204,60,0"
                    Name="button3" VerticalAlignment="Top" Width="70" Click="button3_Click"/>
        </Grid>
    </Grid>
</Window>

Registration form

Figure 2. Registration form

Registration.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Data;
using System.Data.SqlClient;
using System.Text.RegularExpressions;
namespace Login_WPF
{
    /// <summary>
    /// Interaction logic for Registration.xaml
    /// </summary>
    public partial class Registration : Window
    {
        public Registration()
        {
            InitializeComponent();
        }
        private void Login_Click(object sender, RoutedEventArgs e)
        {
            Login login = new Login();
            login.Show();
            Close();
        }
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            Reset();
        }
        public void Reset()
        {
            textBoxFirstName.Text = "";
            textBoxLastName.Text = "";
            textBoxEmail.Text = "";
            textBoxAddress.Text = "";
            passwordBox1.Password = "";
            passwordBoxConfirm.Password = "";
        }
        private void button3_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }
        private void Submit_Click(object sender, RoutedEventArgs e)
        {
            if (textBoxEmail.Text.Length == 0)
            {
                errormessage.Text = "Enter an email.";
                textBoxEmail.Focus();
            }
            else if (!Regex.IsMatch(textBoxEmail.Text, @"^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"))
            {
                errormessage.Text = "Enter a valid email.";
                textBoxEmail.Select(0, textBoxEmail.Text.Length);
                textBoxEmail.Focus();
            }
            else
            {
                string firstname = textBoxFirstName.Text;
                string lastname = textBoxLastName.Text;
                string email = textBoxEmail.Text;
                string password = passwordBox1.Password;
                if (passwordBox1.Password.Length == 0)
                {
                    errormessage.Text = "Enter password.";
                    passwordBox1.Focus();
                }
                else if (passwordBoxConfirm.Password.Length == 0)
                {
                    errormessage.Text = "Enter Confirm password.";
                    passwordBoxConfirm.Focus();
                }
                else if (passwordBox1.Password != passwordBoxConfirm.Password)
                {
                    errormessage.Text = "Confirm password must be same as password.";
                    passwordBoxConfirm.Focus();
                }
                else
                {
                    errormessage.Text = "";
                    string address = textBoxAddress.Text;
                    using (SqlConnection con = new SqlConnection("Data Source=TESTPURU;Initial Catalog=Data;User ID=sa;Password=wintellect"))
                    {
                        con.Open();
                        using (SqlCommand cmd = new SqlCommand("Insert into Registration (FirstName, LastName, Email, Password, Address) values (@FirstName, @LastName, @Email, @Password, @Address)", con))
                        {
                            cmd.Parameters.AddWithValue("@FirstName", firstname);
                            cmd.Parameters.AddWithValue("@LastName", lastname);
                            cmd.Parameters.AddWithValue("@Email", email);
                            cmd.Parameters.AddWithValue("@Password", password);
                            cmd.Parameters.AddWithValue("@Address", address);
                            cmd.CommandType = CommandType.Text;
                            cmd.ExecuteNonQuery();
                        }
                    }
                    errormessage.Text = "You have Registered successfully.";
                    Reset();
                }
            }
        }
    }
}

Now I am taking another form for login as follows.

Login.xaml

Figure 3. Login form

Login.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Data;
using System.Data.SqlClient;
using System.Text.RegularExpressions;

namespace Login_WPF
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class Login : Window
    {
        public Login()
        {
            InitializeComponent();
        }
        Registration registration = new Registration();
        Welcome welcome = new Welcome();
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            if (textBoxEmail.Text.Length == 0)
            {
                errormessage.Text = "Enter an email.";
                textBoxEmail.Focus();
            }
            else if (!Regex.IsMatch(textBoxEmail.Text, @"^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$"))
            {
                errormessage.Text = "Enter a valid email.";
                textBoxEmail.Select(0, textBoxEmail.Text.Length);
                textBoxEmail.Focus();
            }
            else
            {
                string email = textBoxEmail.Text;
                string password = passwordBox1.Password;
                SqlConnection con = new SqlConnection("Data Source=TESTPURU;Initial Catalog=Data;User ID=sa;Password=wintellect");
                con.Open();
                SqlCommand cmd = new SqlCommand("Select * from Registration where Email='" + email + "' and password='" + password + "'", con);
                cmd.CommandType = CommandType.Text;
                SqlDataAdapter adapter = new SqlDataAdapter();
                adapter.SelectCommand = cmd;
                DataSet dataSet = new DataSet();
                adapter.Fill(dataSet);
                if (dataSet.Tables[0].Rows.Count > 0)
                {
                    string username = dataSet.Tables[0].Rows[0]["FirstName"].ToString() + " " + dataSet.Tables[0].Rows[0]["LastName"].ToString();
                    welcome.TextBlockName.Text = username; // Sending value from one form to another form.
                    welcome.Show();
                    Close();
                }
                else
                {
                    errormessage.Text = "Sorry! Please enter existing emailid/password.";
                }

                con.Close();
            }
        }
        private void buttonRegister_Click(object sender, RoutedEventArgs e)
        {
            registration.Show();
            Close();
        }
    }
}

Welcome.xaml

<Window 
    x:Class="Login_WPF.Welcome" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="Welcome" 
    Height="250" 
    Width="400">
    <Grid>
        <TextBlock 
            Height="23" 
            HorizontalAlignment="Left" 
            Margin="10,10,0,0" 
            x:Name="WelcomeHeading" 
            Text="Welcome:" 
            VerticalAlignment="Top" 
            FontSize="17" 
            FontStretch="ExtraCondensed"/>
        <TextBlock 
            Height="23" 
            HorizontalAlignment="Left" 
            Margin="90,10,0,0" 
            x:Name="TextBlockName" 
            VerticalAlignment="Top" 
            FontSize="15" 
            FontStretch="ExtraCondensed"/>
    </Grid>
</Window>

At last if the user login successfully then the welcome message will display on another form as shown below.

User login

Figure 4