判断二个文件是否相同

var hash = System.Security.Cryptography.HashAlgorithm.Create();
string fileName = "Z:\\Tools\\Common\\winx64_12102_database_1of2.zip";
var fileStream = System.IO.File.Open(fileName, System.IO.FileMode.Open);
var bytes1 = hash.ComputeHash(fileStream);
fileStream.Close();

fileName = "Z:\\Tools\\Common\\winx64_12102_database_1of2.zip";
fileStream = System.IO.File.Open(fileName, System.IO.FileMode.Open);
var bytes2 = hash.ComputeHash(fileStream);
fileStream.Close();

if (BitConverter.ToString(bytes1) == BitConverter.ToString(bytes2))
{
Response.Write("相同文件");
}
else
{
Response.Write("不同文件");
}