c# - List<T> overwrites all the items inside a foreach loop to the last value -

i'm trying build windows application in there combo box , during load(), i'm population combo box connection strings availabe in app.config file.

here app.config snippet:

<!-- adding multiple servers in connection string--> <connectionstrings>    <add name="sqlconnect-1"          connectionstring="data source=sahil; initial catalog=recordcomparisontool; integrated security=sspi"          providername="system.data.sqlclient"/>     <add name="sqlconnect-2"      connectionstring="data source=sahil; initial catalog=recordcomparisontool; user id=test; password=12123; integrated security=sspi"      providername="system.data.sqlclient"/>     <add name="sqlconnect-3"      connectionstring="data source=sahil; initial catalog=recordcomparisontool; user id=test; password=32315;  integrated security=true"      providername="system.data.sqlclient"/>  </connectionstrings> 

i have created class compareresult in i'm trying values app.config , displaying combo box.

namespace recordcomparisontool_win {    public class connectionstring    {         public string name { get; set; }         public string constring { get; set; }         public string provider { get; set; }     }      public class compareresult     {          public list<connectionstring> getconnection()         {             list<connectionstring> constr = new list<connectionstring>();             connectionstring conn = new connectionstring();              foreach (connectionstringsettings css in configurationmanager.connectionstrings)             {                 if (!(css.name == "localsqlserver" || css.name == "localmysqlserver"))                 {                     conn.name = css.name;                     conn.constring = css.connectionstring;                     conn.provider = css.providername;                      constr.add(conn);                 }             }             return constr;         }      } } 

the problem when i'm trying bind combo box, showing 3 records per app.config file, records have same value "sqlconnect-3". i'm unable find reason why list got updated "sqlconnect-3" records. please fix error. here snippet i'm binding list combobox

protected void loadconnection() {     compareresult compareresult = new compareresult();      list<connectionstring> connectionstring = new list<connectionstring>();     connectionstring = compareresult.getconnection();      cbtokenleft.datasource = connectionstring;      cbtokenleft.displaymember = "name";     cbtokenleft.valuemember = "constring";  } 

this:

conn.name = css.name; conn.constring = css.connectionstring; conn.provider = css.providername;  constr.add(conn); 

overwrites connectionstring reference each iteration. need allocate new connectionstring within each loop:

foreach (connectionstringsettings css in configurationmanager.connectionstrings) {     if (!(css.name == "localsqlserver" || css.name == "localmysqlserver"))     {         var conn = new connectionstring         {            name = css.name;            constring = css.connectionstring;            provider = css.providername;         }         constr.add(conn);     } }