C# - SHA-1 Hash eines Strings erzeugen

// using System.Security.Cryptography;

/// <summary>
/// Gets the SHA1 hash.
/// </summary>
/// <param name="text">The text.</param>
/// <returns></returns>
public static string GetSha1Hash(string text)
{
    var sha1 = new SHA1CryptoServiceProvider();

    string result = null;

    var arrayData = Encoding.ASCII.GetBytes(text);
    var arrayResult = sha1.ComputeHash(arrayData);
    foreach (var t in arrayResult)
    {
        var temp = Convert.ToString(t, 16);
        if (temp.Length == 1)
            temp = string.Format("0{0}", temp);
        result += temp;
    }
    return result;
}