private void SaveButton_Click(object sender, RoutedEventArgs e)
{
if (fileName != "")
{
TextFileOperations.WriteTextFileContents(fileName, editor.Text);
}
}
private void OpenButton_Click(object sender, RoutedEventArgs e)
{
fileName = GetFileName();
editor.Text = fileName != "" ? TextFileOperations.ReadTextFileContents(fileName) : "";
}