Login and registration process in WPF application

Purushottam Rathore
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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.

Step1: Open Visual Studio 2010 -> File -> New -> Project.

New project template will display and select WPF Application like as follows:

Figure 1:

Step 2: Enter your project name and click on 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 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 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">

<Button.Template>

</TextBlock>

</ControlTemplate>

</Button.Template>

<Button.Style>

<Style.Triggers>

</Trigger>

</Style.Triggers>

</Style>

</Button.Style>

</Button>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

</Grid>

</Window>

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)

{

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;

SqlConnection con = new SqlConnection("Data Source=TESTPURU;Initial Catalog=Data;User ID=sa;Password=wintellect");

con.Open();

SqlCommand cmd = new SqlCommand("Insert into Registration (FirstName,LastName,Email,Password,Address) values('" + firstname + "','" + lastname + "','" + email + "','" + password + "','" + address + "')", con);

cmd.CommandType = CommandType.Text;

cmd.ExecuteNonQuery();

con.Close();

errormessage.Text = "You have Registered successfully.";

Reset();

}

Now I am taking another form for login as follows:

Login.xaml:

<Window x:Class="Login_WPF.Login"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Login" Height="350" Width="525">

<Grid>

Note: Please login here to view the features of this site. If you are new on this site then <LineBreak />

please click on

<Hyperlink Click="buttonRegister_Click" FontSize="14" FontStyle="Normal">Register</Hyperlink>

</TextBlock>

button

</TextBlock>

</Grid>

</Window>

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>

</Grid>

</Window>

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

Figure 4:

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