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 upon the following code -

// Create an MD5 hash digest of a file
public string MD5HashFile(string fn)
{            
    byte[] hash = MD5.Create().ComputeHash(File.ReadAllBytes(fn));
    return BitConverter.ToString(hash).Replace("-", "");            
}

Answer 1

Here's the routine I'm currently using.

    using System.Security.Cryptography;      public string HashFile(string filePath)     {         using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))         {             return HashFile(fs);         }     }      public string HashFile( FileStream stream )     {         StringBuilder sb = new StringBuilder();          if( stream != null )         {             stream.Seek( 0, SeekOrigin.Begin );              MD5 md5 = MD5CryptoServiceProvider.Create();             byte[] hash = md5.ComputeHash( stream );             foreach( byte b in hash )                 sb.Append( b.ToString( "x2" ) );              stream.Seek( 0, SeekOrigin.Begin );         }          return sb.ToString();     } 

Answer 2

Short and to the point. filename is your text file's name:

using (var md5 = MD5.Create())
{
    return BitConverter.ToString(md5.ComputeHash(File.ReadAllBytes(filename))).Replace("-", "");
}