c# - Getting a loop to build a string correctly -

i'm trying pull tournament age webpage:

http://www.reddishvulcans.com/uk_tournament_database.asp

i'm trying create string based on valid ages entry each table.

for example, if "carling cup" enterable 7 year olds, string generated "u7", or if it's enterable 7, 8, , 9 year olds, resulting string "u7, u8, u9".

i've made start, logic break if ages go "under 7s, gap here no under 8s, under 9s".

here code:

public static list<record> getrecords()     {         string url = "http://www.reddishvulcans.com/uk_tournament_database.asp";         var webget = new htmlweb();         var doc = webget.load(url);         var root = doc.documentnode;         var ages = root.selectnodes("//div[@class='infobox']/table/tr[5]/td/img");          list<string> tournamentages = new list<string>();         string agegroups = "";         list<string> agestring = new list<string>();          (int32 = 0; < ages.count(); i++)         {              if (ages[i].getattributevalue("src", "nope") == "images/2016/u6_yes.gif")             {                 if (!agestring.contains(" u6 ")) {                     agestring.add(" u6 ");                     continue;                 }             }             else if (ages[i].getattributevalue("src", "nope") == "images/2016/u6_.gif")             {                 continue;             }              if (ages[i].getattributevalue("src", "nope") == "images/2016/u7_yes.gif")             {                 if (!agestring.contains(" u7 "))                 {                     agestring.add(" u7 ");                     continue;                 }             }             else if (ages[i].getattributevalue("src", "nope") == "images/2016/u7_.gif")             {                 continue;             }              if (ages[i].getattributevalue("src", "nope") == "images/2016/u8_yes.gif")             {                 if (!agestring.contains(" u8 "))                 {                     agestring.add(" u8 ");                     continue;                 }                             }             else if (ages[i].getattributevalue("src", "nope") == "images/2016/u8_.gif")             {                 continue;             }              // checks until u16.gif              foreach (string in agestring)             {                 if (a != "")                 {                     agegroups += a;                 }              }              agestring.clear();             if (agegroups != "")                   {                 tournamentages.add(agegroups);             }             agegroups = "";             }         } } 

to clear, i'm having trouble loop logic.

the flow goes this:

loop through current list of images     if > u6_yes.gif          concatenate u6 agestring     else         continue 

however continue start , stuck in infinite loop, how can make gracefully handle when u6_.gif gone, ignore , go next?

why don't simplify loop this?

if (ages[i].getattributevalue("src", "nope") == "images/2016/u6_yes.gif") {     if (!agestring.contains(" u6 "))     {         agestring.add(" u6 ");         continue;     } }  if (ages[i].getattributevalue("src", "nope") == "images/2016/u7_yes.gif") {     if (!agestring.contains(" u7 "))     {         agestring.add(" u7 ");         continue;         }     } }  (...) 

just remove else if blocks...

also, should consider extraction src attribute ages array. can use linq , make loop lot simplier. this:

list<string> agestring = new list<string>(); list<string> imagesources = ages.where(x => x.getattributevalue("src", "nope").startswith("images/2016/u") && x.getattributevalue("src", "nope").endswith("_yes.gif")).tolist(); foreach (var src in imagesources) {     agestring.add(" " + src.substring(11, 2).toupper() + " "); }