public async Task EnsureExist()
{
var cloudTableClient = new CloudTableClient(this._account.TableEndpoint.ToString(), this._account.Credentials);
await this.StorageRetryPolicy.ExecuteAsync(this.CreateTask(
async => cloudTableClient.BeginCreateTableIfNotExist(this._tableName, async, null),
res => cloudTableClient.EndCreateTableIfNotExist(res)));
}