//------Extend Methods----------
#region 事务处理
/// <summary>
/// 获取事务支持的对象<para />
/// 成功执行的最后，请调用MarkSuccess()，事务结束前会自动Commit;
/// 发生错误或者不显式MarkSuccess()的情况下，均会自动Rollback所有修改;
/// </summary>
/// <param name="IsolationLevel">隔离等级</param>
public static DBTransaction CreateTransaction(IsolationLevel IsolationLevel)
{
DBTransaction result = new DBTransaction(IsolationLevel);
result.Init(SqlConnectionString);
if (result.IsInitialize == false)
throw new InvalidOperationException("Create transaction faild.");
return result;
}
