//Delete files from specified path that have the specified extensions

private void delete_ext(string path, string ext)
{
	string[] fileNames = System.IO.Directory.GetFiles(path);

	foreach ( string strFiles in fileNames )
	{
		System.IO.FileInfo info = new System.IO.FileInfo(strFiles);
			if (info.Extension.ToLower() == ext.ToLower())
		{
			System.IO.File.Delete(info.ToString());
		}
	}
}