xml - C# foreach loop outer string not updating as normal -


i know that's it's better write xml documents proper class i'm short in time , want quick result.

i tried write xml file in string save xml file. result not correct, because string getting last value of foreach loop every time.

i searched problem , found out need initiate string inside foreach loop, didn't understand concept , didn't know exactly.

what should modify in code? 

string sitemap = "<? xml version = \"1.0\" encoding = \"utf-8\" ?>";  list<string> niveau1titles = getniveau1titles(aux1); list<list<couple>> niveau2titles = getniveau2titles(aux1);  int = 0; foreach (var n2 in niveau2titles) {     sitemap += "<niveau_1 title = \"" + niveau1titles[i] + "\" >";     foreach (var n22 in n2)     {         sitemap += "<niveau_2 title = \"" + n22.title + "\" link = \"" + n22.link + "\" >";         list<couple> niveau3titles = new list<couple>();         niveau3titles = getniveau3titles(n22.link);         foreach(var n3 in niveau3titles)         {             sitemap += "<niveau_3 title = \"" + n3.title + "\" link = \"" + n3.link + "\" />";         }         sitemap += "</niveau_2>";      }     sitemap += "</niveau_1>";     i++; }   console.writeline(sitemap);

i think code working correctly. have multiple root elements in xml. need add root. have space in xml identification line. try code below.

using system; using system.collections.generic; using system.linq; using system.text;  namespace consoleapplication1 {     class program     {         static void main(string[] args)         {             string aux1 = "";             //remove space             string sitemap = "<?xml version = \"1.0\" encoding = \"utf-8\" ?>";             sitemap += "<root>";              list<string> niveau1titles = getniveau1titles(aux1);             list<list<couple>> niveau2titles = getniveau2titles(aux1);              int = 0;             foreach (var n2 in niveau2titles)             {                 sitemap += "<niveau_1 title = \"" + niveau1titles[i] + "\" >";                 foreach (var n22 in n2)                 {                     sitemap += "<niveau_2 title = \"" + n22.title + "\" link = \"" + n22.link + "\" >";                     list<couple> niveau3titles = new list<couple>();                     niveau3titles = getniveau3titles(n22.link);                     foreach (var n3 in niveau3titles)                     {                         sitemap += "<niveau_3 title = \"" + n3.title + "\" link = \"" + n3.link + "\" />";                     }                     sitemap += "</niveau_2>";                  }                 sitemap += "</niveau_1>";                 i++;             }             sitemap += "</root>";               console.writeline(sitemap);             console.readline();         }         static list<string> getniveau1titles(string aux1)         {             return new list<string> { "aaa", "aab", "aac", "aad" };         }         static list<list<couple>> getniveau2titles(string aux1)         {             return new list<list<couple>>() {                    new list<couple>() {new couple() { title = "t11", link =  "l11"}, new couple() { title = "t12", link =  "l12"}, new couple() { title = "t13", link =  "l13"} },                   new list<couple>() {new couple() { title = "t21", link =  "l21"}, new couple() { title = "t22", link =  "l22"}, new couple() { title = "t23", link =  "l23"} },                   new list<couple>() {new couple() { title = "t31", link =  "l31"}, new couple() { title = "t32", link =  "l32"}, new couple() { title = "t33", link =  "l33"} },                   new list<couple>() {new couple() { title = "t41", link =  "l41"}, new couple() { title = "t42", link =  "l42"}, new couple() { title = "t43", link =  "l43"} }             };         }         static list<couple> getniveau3titles(string aux1)         {             return new list<couple>() { new couple() { title = "t100", link = "l100" }, new couple() { title = "t101", link = "l101" }, new couple() { title = "t102", link = "l102" } };         }      }     public class couple     {         public string title { get; set; }         public string link { get; set; }     }  } ​

here xml results

<?xml version = "1.0" encoding = "utf-8" ?> <root>   <niveau_1 title = "aaa" >     <niveau_2 title = "t11" link = "l11" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t12" link = "l12" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t13" link = "l13" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>   </niveau_1>   <niveau_1 title = "aab" >     <niveau_2 title = "t21" link = "l21" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t22" link = "l22" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t23" link = "l23" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>   </niveau_1>   <niveau_1 title = "aac" >     <niveau_2 title = "t31" link = "l31" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t32" link = "l32" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t33" link = "l33" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>   </niveau_1>   <niveau_1 title = "aad" >     <niveau_2 title = "t41" link = "l41" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t42" link = "l42" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>     <niveau_2 title = "t43" link = "l43" >       <niveau_3 title = "t100" link = "l100" />       <niveau_3 title = "t101" link = "l101" />       <niveau_3 title = "t102" link = "l102" />     </niveau_2>   </niveau_1> </root>​

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