private void loginEdit_TextChanged(object sender, TextChangedEventArgs e)
{
UsefulThings.controlLettersAndDigits(sender as TextBox);
openBtn.IsEnabled = createBtn.IsEnabled = loginEdit.Text.Length > 0;
}
private void nameEdit_TextChanged(object sender, TextChangedEventArgs e)
{
UsefulThings.controlLettersAndDigits(sender as TextBox);
okBtn.IsEnabled = nameEdit.Text.Length > 0;
}
