How do I create an MD5 hash digest from a text file?

Question

Using C#, I want to create an MD5 hash of a text file. How can I accomplish this?

Update: Thanks to everyone for their help. I\'ve finally settled u

Answer 1

internal static string GetHashCode(string filePath, HashAlgorithm cryptoService)
{
// create or use the instance of the crypto service provider
// this can be either MD5, SHA1, SHA256, SHA384 or SHA512
using (cryptoService)
{
    using (var fileStream = new FileStream(filePath, 
                                           FileMode.Open, 
                                           FileAccess.Read, 
                                           FileShare.ReadWrite))
    {
        var hash = cryptoService.ComputeHash(fileStream);
        var hashString = Convert.ToBase64String(hash);
        return hashString.TrimEnd('=');
     }
  }
}


  WriteLine("MD5 Hash Code   : {0}", GetHashCode(FilePath, new MD5CryptoServiceProvider()));
  WriteLine("SHA1 Hash Code  : {0}", GetHashCode(FilePath, new SHA1CryptoServiceProvider()));
  WriteLine("SHA256 Hash Code: {0}", GetHashCode(FilePath, new SHA256CryptoServiceProvider()));
  WriteLine("SHA384 Hash Code: {0}", GetHashCode(FilePath, new SHA384CryptoServiceProvider()));
  WriteLine("SHA512 Hash Code: {0}", GetHashCode(FilePath, new SHA512CryptoServiceProvider()));