判断DataSet是否有数据

 if (data1.Tables[0].Rows.Count>0)
        {
            MessageInfoText.Text = data1.Tables[0].Rows[0]["MessageText"].ToString() != "" ? data1.Tables[0].Rows[0]["MessageText"].ToString() : "";
            TimeText.Text = data1.Tables[0].Rows[0]["PushMessageDate"].ToString() != "" ? data1.Tables[0].Rows[0]["PushMessageDate"].ToString() : "";
        }