private void buttonLogIn_Click(object sender, EventArgs e)
{
// store employees email for later use
string employeeEmail = comboBoxEmail.Text;
// validate email and store any error messages received
string errorMessage = LoginValidation.ValidateEmail(comboBoxEmail.Text);
// if error message returned, turn the flag on
if (!string.IsNullOrWhiteSpace(errorMessage))
{
errorProvider.SetError(comboBoxEmail, errorMessage);
return;
}
// check if password was not left blank before continuing
if (string.IsNullOrWhiteSpace(textBoxPassword.Text))
{
errorProvider.SetError(textBoxPassword, "Password must not be left blank!");
return;
}
// store results of validation as boolean values (bool emailValid, bool passwordValid)
var(emailValid, passwordValid) = LoginValidation.ValidateCredentials(employeeEmail, textBoxPassword.Text);
// if both email and password are valid, continue to main application
if (emailValid && passwordValid)
{
// add logon entry to log file
FileWriter.WriteLog("login");
// if email address already occurs in the log file, delete it
FileWriter.DeleteLine(MAIL_LOG_FILE, FileWriter.ContainsLine(MAIL_LOG_FILE, employeeEmail));
// insert email address at the beginning of the file
FileWriter.InsertAtBeginning(MAIL_LOG_FILE, employeeEmail);
// hide current form
this.Hide();
// create main form and open it
using (Main MainApplication = new Main(employeeEmail))
MainApplication.ShowDialog();
// once main application closes, add logoff entry to event file
FileWriter.WriteLog("logout");
// open login page again
this.Show();
// load default settings of the login page
LoadDefaultSettings();
}
// else if email incorrect
else if (!emailValid)
{
errorProvider.SetError(comboBoxEmail, "Email address incorrect!");
}
// else if password incorrect
else if (!passwordValid)
{
errorProvider.SetError(textBoxPassword, "Password incorrect!");
}
// in case of any inexpected errors
else
{
FileWriter.WriteLog("login validation error");
MessageBox.Show("Please report this error to your manager.", "Unexpected Error");
}
}