上传数据到Windows Azure时收到409错误

我试图上传一些数据到我的Windows Azure存储帐户，并在执行代码时遇到异常。例外情况如下:

类型为"Microsoft.WindowsAzure.Storage"的异常。在Microsoft.WindowsAzure.Storage.dll中发生了"StorageException"，但未在用户代码中处理。附加信息:远程服务器返回了一个错误:(409)Conflict.

这是我的代码，每次我尝试，Visual Studio总是告诉我它在不同的地方坏了。

// Retrieve storage account from the connection string.
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
        // Create the table client.
        CloudTableClient tableClient = storageAccount.CreateCloudTableClient();
        // Create the table if it doesn't exist.
        CloudTable table = tableClient.GetTableReference("articles");
        table.CreateIfNotExists();
        // Create a new article entity.
        Article neumeier = new Article("Israel will strike Iran in the next 5 years", "NeumeierJ.R");
        neumeier.User = "NeumeierJ.R";
        neumeier.Tagline = "Israel will strike Iran in the next 5 years";
        neumeier.UserCredentials = "Founder of Codex.Library";
        neumeier.UserEmail = "NeumeierJ.R@outlook.com";
        neumeier.Author = "Chomsky";
        neumeier.AuthorCredentials = "Everyone knows Chomsky...";
        neumeier.Category = "LD2015";
        neumeier.Citation = "CNN or something like that.";
        neumeier.Content = "It is inevitable that Israel will attack Iran, or vice versa. In the hotbed of conflict in the MidEast.";
        // Create the TableOperation that inserts the article entity.
        TableOperation insertOperation = TableOperation.Insert(neumeier);
        // Execute the insert operation.
        table.Execute(insertOperation);
        // End Azure Test

我应该使用所有正确的引用和使用语句…

using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Table;
using Microsoft.WindowsAzure.Storage.Auth;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Security.Claims;
using System.Web.Http;
using System.Configuration;

很抱歉格式不好，第一个问题。任何帮助将是伟大的，谢谢!