private static void DeleteKeyMaterial(KmsClient kmsClient, string keyId)
 {
     try
     {
         var req = new DeleteImportedKeyMaterialRequest
         {
             VersionId = "v1.0",
             Body      = new OperateKeyRequestBody
             {
                 KeyId = keyId
             }
         };
         var resp = kmsClient.DeleteImportedKeyMaterial(req);
         Console.WriteLine(resp.GetHttpStatusCode());
     }
     catch (RequestTimeoutException requestTimeoutException)
     {
         Console.WriteLine(requestTimeoutException.ErrorMessage);
     }
     catch (ServiceResponseException clientRequestException)
     {
         Console.WriteLine(clientRequestException.HttpStatusCode);
         Console.WriteLine(clientRequestException.ErrorCode);
         Console.WriteLine(clientRequestException.ErrorMsg);
     }
     catch (ConnectionException connectionException)
     {
         Console.WriteLine(connectionException.ErrorMessage);
     }
 }