using System.Security.Cryptography.X509Certificates;

private static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
{
	if (errors == SslPolicyErrors.None)
		return true;
	return false;
}

//配置证书回调方法
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
//配置请求
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sUrl);
request.Method = "POST";
X509Certificate objx509 = new X509Certificate(Application.StartupPath + "\\ForestarAuth.cer");	//可以在第二个参数中传入证书密码
request.ClientCertificates.Add(objx509);
//获取请求结果
HttpWebResponse res = (HttpWebResponse)request.GetResponse();
if (res.StatusCode != HttpStatusCode.OK)
{
    response = "连接错误，状态码：" + res.StatusCode.ToString();
    return false;
}
//读取请求结果
Stream resStream = res.GetResponseStream();
StreamReader sReader = new StreamReader(resStream, Encoding.GetEncoding("utf-8"));
char[] buffer = new char[256];
int count = sReader.Read(buffer, 0, 256);
StringBuilder sb = new StringBuilder();
while (count > 0)
{
    String sTemp = new String(buffer, 0, count);
    sb.Append(sTemp);
    count = sReader.Read(buffer, 0, 256);
}
response = sb.ToString();

/// <summary>
/// 操作系统信息
/// </summary>
public string OSInfo
{
    get
    {
        return Environment.OSVersion.ToString();
    }
}

/// <summary>
/// BIOS序列号
/// </summary>
public string BIOSNumber
{
    get
    {
        try
        {
            var query = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS WHERE (SerialNumber IS NOT NULL)").Get();
            string result = string.Empty;
            foreach (var obj in query)
            {
                result = obj["SerialNumber"].ToString();
                break;
            }
            return result;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// 处理器序列号
/// </summary>
public string CPUNumber
{
    get
    {
        try
        {
            var query = new ManagementObjectSearcher("SELECT * FROM Win32_Processor WHERE (ProcessorId IS NOT NULL)").Get();
            string result = string.Empty;
            foreach (var obj in query)
            {
                result = obj["Processorid"].ToString();
                break;
            }
            return result;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// 内存信息
/// </summary>
public string MemoryNumber
{
    get
    {
        try
        {
            var query = new ManagementObjectSearcher("SELECT * FROM Win32_PhysicalMemory").Get();
            string result = string.Empty;
            foreach (var obj in query)
            {
                result = obj["PartNumber"].ToString();
                break;
            }
            return result;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// 主板序列号
/// </summary>
public string BaseBoardNumber
{
    get
    {
        try
        {
            var query = new ManagementObjectSearcher("SELECT * FROM Win32_BaseBoard WHERE (SerialNumber IS NOT NULL)").Get();
            string result = string.Empty;
            foreach (var obj in query)
            {
                result = obj["SerialNumber"].ToString();
                break;
            }
            return result;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// 硬盘序列号
/// </summary>
public string HardDiskNumber
{
    get
    {
        try
        {
            var query = new ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive WHERE (SerialNumber IS NOT NULL) AND (MediaType LIKE 'Fixed hard disk%')").Get();
            string result = string.Empty;
            foreach (var obj in query)
            {
                result = obj["SerialNumber"].ToString();
                break;
            }
            return result;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// 网卡信息
/// </summary>
public string NetWorkInfo
{
    get
    {
        try
        {
            var query = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapter WHERE (MACAddress IS NOT NULL) AND (NOT (PNPDeviceID LIKE 'ROOT%'))").Get();
            string result = string.Empty;
            foreach (var obj in query)
            {
                result = obj["MACAddress"].ToString();
                break;
            }
            return result;
        }
        catch
        {
            return "";
        }
    }
}

/// <summary>
/// OnPaintBackground 事件
/// </summary>
/// <param name="e"></param>
protected override void OnPaintBackground(PaintEventArgs e)
{
    // 重载基类的背景擦除函数，
    // 解决窗口刷新，放大，图像闪烁
    return;
}