HashPassword Method for Entity Framework MVC3 Razor Custom Member Provider C# Using LINQ

// helper method
private byte[] HashPassword(string password)
{
    // NKT: This will only work with a new database, 
    // otherwise existing passwords will be broken.
    // If you use this, be sure to set the saltvalue to your own 
    // customization in the web.config file in your web app
    // <add key="SaltValue" value="*!ShiningStar!*" />
    // This won't work with an existing database, as they won't have the salt value
    // so make sure you alter the password hash or encryption as needed for an existing database...
    CryptoProvider crypto = new CryptoProvider();
    byte[] hashedPassword = crypto.EncryptData(password.Trim());
    return hashedPassword;
}

public static string GetSaltValue()
{
    string saltValue = ConfigurationManager.AppSettings["SaltValue"];
    return saltValue;
}

public byte[] EncryptData(string dataString)
{

    // NKT: custom method using functionality from this article
    // http://www.4guysfromrolla.com/articles/103002-1.2.aspx
    // salting has value
    //http://www.4guysfromrolla.com/articles/112002-1.aspx
    // this isn't as secure as a unique salt per user, but if you use a unique salt per site, 
    //at least they won't know that salt value if they steal the 
    // database and not the web.config file
    // store the saltvalue in the web.config file. make unique per website.
    string saltedString = dataString + GetSaltValue();

    MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
    byte[] hashedDataBytes = null;
    UTF8Encoding encoder = new UTF8Encoding();
    hashedDataBytes = md5Hasher.ComputeHash(encoder.GetBytes(saltedString));

    return hashedDataBytes;

}