Xpath to collect data

Question

I’m developing a bot to capture certain information from websites, but when I try to collect the information related to the description of the item collected, it does not go through the while effectuating the other collections.

It saves different information, but adds the same description for all items.

Follow the code excerpt:

var target = trs[tr_num].SelectNodes("//button[@class='btn btn-default']")
    [0].Attributes["data-target"].Value.CopyAfter("#").Trim();

string xpathCompara = ("//section[@id='about']/div[@id='" + target + "']");