asp.net - C# - Genereic List copy one row add Another row -

am having list of students , on condition need copy 1 row , add row minor change

for example:

class student having follwing properties

public class student {           public int id { get; set; }          public string name { get; set; }     public string section { get; set; }     public int marks { get; set; } } 

so while looping through list if marks = 90 need copy row , add row updating section

 foreach (var item in studentdata)  {     if(item.section == 90)     {         //i need add logic , update section , copy item          //add modified item new item studentdata     }  } 

if student class had 3 items initially

1 "sam" "a" 48 1 "john" "b" 68 1 "broad" "a" 90 

my expected output be

1 "sam" "a" 48 1 "john" "b" 68 1 "broad" "a" 90 1 "broad" "c" 90   //where added 1 more row modifying section 

what easiest way without looping ? stuck!!

i believe clear question atleast example !!

thanks

you can't add items collections you're iterating, create list, add copies , in end add items list studentdata.

something this:

var copies = new list<student>();  foreach (var item in studentdata) {     if(item.section == 90)     {         var copy = new student();         copy.id = item.id;         copy.name = item.name;         copy.marks = item.marks;         copy.section = // updates section         copies.add(copy);     } }  studentdata.addrange(copies);