try
{
  string bucket = "examplebucket-1250000000"; // Bucket in the format: BucketName-APPID
  string key = "exampleobject"; // Object key
  string origin = "http://cloud.tencent.com";
  string accessMthod = "PUT";
  OptionObjectRequest request = new OptionObjectRequest(bucket, key, origin, accessMthod);
  // Set the validity period of the signature
  request.SetSign(TimeUtils.GetCurrentTime(TimeUnit.SECONDS), 600);
  // Execute the request
  OptionObjectResult result = cosXml.OptionObject(request);
  // Request succeeded
  Console.WriteLine(result.GetResultInfo());
}
catch (COSXML.CosException.CosClientException clientEx)
{
  // Request failed
  Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
  // Request failed
  Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}