private void BtnOk_Click(object sender, RoutedEventArgs e)
{
if (string.IsNullOrEmpty(UsernameText.Text))
{
MessageBox.Show("You must enter a name!", "Invalid Name", MessageBoxButton.OK, MessageBoxImage.Warning);
return;
}
if (AllUsers.Any(u => u.Username.Equals(UsernameText.Text, StringComparison.CurrentCultureIgnoreCase)))
{
MessageBox.Show("A user with that name already exists!", "Duplicate Name", MessageBoxButton.OK, MessageBoxImage.Warning);
return;
}
Username = UsernameText.Text;
Close();
}
public bool UserHasRequested(string username)
{
return(AllUsers.Any(x => x.Equals(username, StringComparison.OrdinalIgnoreCase)));
}