private void BtnRegister_Click(object sender, EventArgs e)
{
//Regex for checking username
var userNameRegex = new Regex("^[a-zA-Z][a-zA-Z0-5]{5,}$");
//Regex for checking name
var nameRegex = new Regex("^[a-zA-Z][a-zA-Z ]{4,}$");
//Regex for checking password
var passwordRegex = new Regex("^(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,20})$");
//Checking whether the given input data is valid or not by using corresponding regex
if (!nameRegex.IsMatch(TextboxName.Text) ||
!userNameRegex.IsMatch(TextboxUsername.Text) ||
!passwordRegex.IsMatch(TextboxPassword.Text) ||
!passwordRegex.IsMatch(TextboxPassConfirm.Text) ||
TextboxPassword.Text != TextboxPassConfirm.Text)
{
//Checking whether given name is valid
if (!nameRegex.IsMatch(TextboxName.Text))
{
MessageBox.Show("Please enter a valid Name! **At Least 5 characters and space between name are only allowed**");
}
//Checking whether given username is valid
else if (!userNameRegex.IsMatch(TextboxUsername.Text))
{
MessageBox.Show("Please enter a valid User Name! **At Least 6 characters(alphabets and digits only) are required and must present alphabet and digits**");
}
//Checking whether given name is valid
else if (!passwordRegex.IsMatch(TextboxPassword.Text))
{
MessageBox.Show("Please enter a valid Password!**At Least 8 and At most 20 characters(alphabets and digits only) are required and must have at least an alphabet and a digit.**");
}
//Checking whether given password is valid
else if (!passwordRegex.IsMatch(TextboxPassConfirm.Text))
{
MessageBox.Show("Please enter a valid Confirm Password!**At Least 8 and At most 20 characters(alphabets and digits only) are required and must have at least an alphabet and a digit**");
}
//Checking whether given confirm password is valid
else if (TextboxPassword.Text != TextboxPassConfirm.Text)
{
MessageBox.Show("Password and Confirm Password Doesn't Match!");
}
else
{
//for future logic
}
}
//Given data is valid to be inserted into database
else
{
//Creating string instance of the given username
string uname = TextboxUsername.Text;
//creating local instance of database context to communicate withe database
using (RechargeGauntletDataContext _context = new RechargeGauntletDataContext())
{
//Checking if the given username already exists in the database
if (_context.Users.Count(u => u.Username == uname) != 0)
{
MessageBox.Show("Username already Exists!");
}
//Username doesn't exists in the database
else
{
//Creating string instance of the given password
string password = TextboxPassword.Text;
//Creating string instance of the hashed version of given password
string hashedPassword = PasswordHasher.Hash(password);
//creating a new User Instance to be inserted to the User Table
User user = new User
{
//Initializing properties of User
Username = uname,
Name = TextboxName.Text,
PasswordHash = hashedPassword
};
//Adding new Instance to the instance of database.
_context.Users.InsertOnSubmit(user);
//Saving changes
_context.SubmitChanges();
MessageBox.Show("Registered!");
}
}
}
}
private void BtnLogin_Click(object sender, EventArgs e)
{
//Regex to check Username
var userNameRegex = new Regex("^[a-zA-Z][a-zA-Z0-5]{5,}$");
//Regex to check Password
var passwordRegex = new Regex("^(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,20})$");
//Checking first if the username and password is valid
if (!userNameRegex.IsMatch(TextboxUserName.Text) ||
!passwordRegex.IsMatch(TextboxPassword.Text))
{
//Username is found not valid
if (!userNameRegex.IsMatch(TextboxUserName.Text))
{
MessageBox.Show("Please enter a valid User Name! **At Least 6 characters(alphabets and digits only) are required and must present alphabet and digits**");
}
//Password is found not valid
else if (!passwordRegex.IsMatch(TextboxPassword.Text))
{
MessageBox.Show("Please enter a valid Password!**At Least 8 and At most 20 characters(alphabets and digits only) are required and must have at least an alphabet and a digit.**");
}
else
{
//For future validations
}
}
//Username and password are found valid, now checking if they are correct by matching them with database existing pairs.
else
{
//Creating a local instance of Database context class
using (RechargeGauntletDataContext _context = new RechargeGauntletDataContext())
{
//Fetching the particular record of the given username
var user = (from u in _context.Users
where u.Username == TextboxUserName.Text
select u).FirstOrDefault();
//Checking if the given username exists in the database
if (user == null)
{
MessageBox.Show("Username doesn't exist!");
}
//Given Username exists in the database
else
{
//creating a hashed password's string instance.
string hashedPassword = user.PasswordHash;
//Checking whether the given password matches with the existing hashed password
if (PasswordHasher.Verify(TextboxPassword.Text, hashedPassword))
{
MessageBox.Show("Logging In!");
}
//Passwords doesn't match
else
{
MessageBox.Show("Incorrect Password!");
}
}
}
}
}
