//This method checks to see if password and username input from each textbox matches password and username data stored in the LecturerLogin table of the application database.
public void LoginLecturer()
{
ModelRegisterLogin lect = new ModelRegisterLogin();
//Generic collections List <T> is used to hold all the lecturer login details for processing. The list is instantiated using a method that retrieves all the login details from the application database, LecturerLogin.
List <ModelRegisterLogin> list = cl.GetAllFromLecturerLogin(connectionString);
//A lambda expression combined with a try catch is used to determines if the users username input taken from the login texbox matchs any username objects of the Model Class ModelRegisterLogin - this Model Class holds properties for both the lecturer and student user types.
try
{
lect = list.Find((ModelRegisterLogin x) => x.LECT_USERNAME == Int32.Parse(tbUsernameLog.Text));
//The lambda expression above checks if any dataabase username data matches the user input from the username texbox.
if (lect.LECT_USERNAME.ToString().Equals(tbUsernameLog.Text) && lect.LECT_PASSWORD.ToString().Equals(tbPasswordLog.Password))
{
MessageBox.Show("Login Successful !\nWelcome LECTURER " + lect.LECT_USERNAME.ToString());
;
MainMenuLecturer mml = new MainMenuLecturer(Int32.Parse(tbUsernameLog.Text));
mml.Show();
this.Close();
}
else
{ //if a username is found but the password doesnt match then this message will be displayed to the user
MessageBox.Show("Incorrect username or password\nPlease recheck your credentials and try again", "Error");
tbUsernameLog.Text = "";
tbPasswordLog.Password = "";
}
}
catch (System.Exception)
{ //If no username match is found the application will throw an error which indicates that no such data with in the database matches that of the user data.
//If this is so then the application displays the following message.
MessageBox.Show("Incorrect username or password\nPlease recheck your credentials and try again", "Error");
tbUsernameLog.Text = "";
tbPasswordLog.Password = "";
}
}
public void LoginLecturer()
{
ModelRegisterLogin lect = new ModelRegisterLogin();
List <ModelRegisterLogin> list = cl.GetAllFromLecturerLogin(connectionString);
try
{
lect = list.Find((ModelRegisterLogin x) => x.LECT_USERNAME == tbUsernameLog.Text);
if (lect.LECT_USERNAME.ToString().Equals(tbUsernameLog.Text) && lect.LECT_PASSWORD.ToString().Equals(tbPasswordLog.Password))
{
MessageBox.Show("Login Successful !,\n Welcome LECTURER " + lect.LECT_USERNAME.ToString());
MainMenuLecturer mml = new MainMenuLecturer();
mml.Show();
this.Close();
}
else
{
MessageBox.Show("Incorrect username or password\nPlease recheck your credentials and try again", "Error");
tbUsernameLog.Text = "";
tbPasswordLog.Password = "";
}
}
catch (System.Exception)
{
MessageBox.Show("Incorrect username or password\nPlease recheck your credentials and try again", "Error");
tbUsernameLog.Text = "";
tbPasswordLog.Password = "";
}
}
