public void SetUp()
{
_originalFile=Path.GetTempFileName();
_taggedFile1=Path.GetTempFileName();
_taggedFile2=Path.GetTempFileName();
File.Delete(_originalFile);
File.Delete(_taggedFile1);
File.Delete(_taggedFile2);
FileStream stream=File.Open(_originalFile, FileMode.CreateNew, FileAccess.Write, FileShare.Write);
byte[] data=GetRandomByteArray(1, 1);
stream.Write(data, 0, data.Length);
stream.Close();
File.Copy(_originalFile, _taggedFile1);
File.Copy(_originalFile, _taggedFile2);
}