/// <summary>
/// Gets the file and assign methods to events.
/// </summary>
/// <param name="path">Specifies the absolute path where the file will be saved</param>
/// <param name="app">Enumeration type <see cref="TociApp.Managed.AppToInstall"/> representing applications</param>
/// <param name="completedDownload">Represents the method that will handle the MethodName<see langword="Completed" /> event of an asynchronous operation.</param>
/// <param name="progress">Represents the method that will handle the <see cref="E:System.Net.WebClient.DownloadProgressChanged" /> event of a <see cref="T:System.Net.WebClient" /></param>
/// <exception cref="System.IO.DirectoryNotFoundException">The specified path was not found.</exception>
public void DownloadFile(string path, AppToInstall app,
AsyncCompletedEventHandler completedDownload = null, DownloadProgressChangedEventHandler progress = null)
{
if (String.IsNullOrEmpty(path) && !Directory.Exists(path))
{
throw new DirectoryNotFoundException("Directory not found or not exist");
}
DownloadFile downloadFile = new DownloadFile();
App[app].DownloadDirectory = path;
downloadFile.Progress += progress;
downloadFile.Complate += completedDownload;
downloadFile.DwnloadFile(path, App[app]);
}