// checks for an existing user before processing sign in
private void AttemptSignIn(string username, string password)
{
if (signInService.UsernameExists(username))
{
if (signInService.ProcessSignIn(username, password))
{
Main main = new Main(username);
main.Show();
this.Dispose();
}
else
{
OutcomeMsg.Text = " Error! Entered password was incorrect!";
}
}
else
{
OutcomeMsg.Text = "Error! No such user exists";
}
}