Directory Copy in C#

DirecoryCopy.cs

/// <summary>
/// Function to copy all files from one directory to another( if destination dir not exist then create it )
/// </summary>
/// <param name="sourceDirName">path of source directory</param>
/// <param name="destDirName">path of destination directory</param>
/// <param name="copySubDirs">want to copy sub directories or not</param>
 
 private static void DirectoryCopy(string sourceDirName, string destDirName, bool copySubDirs)
{
	DirectoryInfo dir = new DirectoryInfo(sourceDirName);
        DirectoryInfo[] dirs = dir.GetDirectories();
 
        if (!dir.Exists)
        {
        	throw new DirectoryNotFoundException("Source directory does not exist or could not be found: "
                    + sourceDirName);
	}
 
        if (!Directory.Exists(destDirName))
        {
        	Directory.CreateDirectory(destDirName);
        }
 
        FileInfo[] files = dir.GetFiles();
        foreach (FileInfo file in files)
        {
        	string temppath = Path.Combine(destDirName, file.Name);
                if (!File.Exists(temppath))
                {
                    file.CopyTo(temppath, false);
                }
        }
 
        if (copySubDirs)
        {
                foreach (DirectoryInfo subdir in dirs)
                {
                    string temppath = Path.Combine(destDirName, subdir.Name);
                    DirectoryCopy(subdir.FullName, temppath, copySubDirs);
                }
        }
}