如何检查一个DataSet中是否为空？

 #region //检查返回的结果集（DataSet）中是否有数据
    private bool CheckEOF(DataSet ds)
    {
        bool flag1;
        if (ds == null)
        {
            flag1 = false;
        }
        else
        {
            if (ds.Tables.Count <= 0)
            {
                flag1 = false;
            }
            else
            {
                if (ds.Tables[0].Rows.Count <= 0)
                {
                    flag1 = false;

                }
                else
                {
                    flag1 = true;
                }
            }
        }

        return flag1;
    }
    #endregion