/// <summary>
/// A helper function that asks user for a SaveAs name and returns their new choice.
/// </summary>
/// <param name="fileSpec">The file specification to filter the files.</param>
/// <param name="oldFilename">The current file name.</param>
/// <returns>Returns the new file name or null if action cancelled by user.</returns>
public string AskUserForSaveFileName(string fileSpec, string oldFilename)
{
return(view.AskUserForSaveFileName(fileSpec, oldFilename));
}