.NET中对字符串进行MD5加密

/// <summary>
/// 对字符串进行MD5加密
/// </summary>
/// <param name="str">需要加密的字符串</param>
/// <returns>md5加密后的字符串</returns>
protected string HashMD5_String(string str)
{
    return FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5");
}