How should I compute files hash(md5 & SHA1) in C#

Question

This is my first C# project and I'm almost newbie. I use openfiledialoge for selecting file and get the filepath by GetFullPath method and store it in a variable called for example fpath. I need to calculate the hash of the file that its path is stored in fpath variable.I think it can be done via GetHashCode. Can anybody give me a snippet or a little guide?

Answer 1

using (FileStream stream = File.OpenRead(file))
{
    SHA256Managed sha = new SHA256Managed();
    byte[] hash = sha.ComputeHash(stream);
    return BitConverter.ToString(hash).Replace("-", String.Empty);
}

Answer 2

Here is a complete code using C# managed library to compute the hash.

using system.IO;
using System.Security.Cryptography;

public string GetSha1Hash(string filePath)
{
    using (FileStream fs = File.OpenRead(filePath))
    {
        SHA1 sha = new SHA1Managed();
        return BitConverter.ToString(sha.ComputeHash(fs));
    }
}