c# - Add hyphen or underscore between two int -

i trying id's database. if 1 value works expected want method return more 1 value. example

if, id1 = 1 , id2 = 2 want display 1-2 or 1_2. can't seem figure out how put hyphen - or underscore _ between 2 int. code below

public int getid() {     using (sqlconnection connection = new sqlconnection(connectionstring))     {          string username = httpcontext.current.user.identity.name;          userinfo info = new userinfo();          using (sqlcommand cmd = new sqlcommand("select firstid, secondid mytable username=@username"))         {             cmd.parameters.addwithvalue("username", username);             cmd.connection = connection;             connection.open();             using (sqldatareader reader = cmd.executereader())             {                 while (reader.read())                 {                     info.firstid = reader.getint32(0);                     info.secondid = reader.getint32(1);                 }             }         }         return info.firstid + "_" + info.secondid;     } } 

my userinfo class has basic get , set properties. have come across tuple today. i've tried using tuple values displayed (1,2). tuple of course can add underscore _ or hyphen - problem can't rid of brackets ()and comma , separates values. can please point me in right direction. in advance , support.

the method claims return int:

public int getid() 

but sort of attempts return string:

return info.firstid + "_" + info.secondid; 

a hyphen or underscore means it's no longer numeric data type, it's string. you'd have return string:

public string getid() {     // etc.      return string.format("{0}_{1}", info.firstid, info.secondid); } 

if want data still structured in way, suggest tuple<int, int> trick:

public tuple<int, int> getid() {     // etc.      return new tuple<int, int>(info.firstid, info.secondid); } 

then consuming code decide how display it:

var id = getid(); console.write(string.format("{0}_{1}", id.item1, id.item2)); 

this means you'd using unintuitive names item1 , item2. if want more aptly named, can introduce custom object:

public class ids {     public int firstid { get; set; }     public int secondid { get; set; } } 

then return instance of that. approach has added advantages:

• you can rename firstid , secondid more meaningful names
• you can make object immutable making setters private , adding constructor accepts values
• you can override .tostring() give default string representation underscore

for example:

public class ids {     public int firstid { get; private set; }     public int secondid { get; private set; }      private ids() { }      public ids(int firstid, int secondid)     {         firstid = firstid;         secondid = secondid;     }      public override string tostring()     {         return string.format("{0}_{1}", firstid, secondid);     } } 

then return instance of that:

public ids getid() {     // etc.      return new ids(info.firstid, info.secondid); } 

and consuming code can display as-is, since string representation internally defined:

var id = getid(); console.write(id);