how to return multiple values from a method in c# to a call in to Lua script

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C#3.0

C#

Lua

Hi,
i have a c# function .

public bool setvar(string varname)
   {
       int value = 0;
       try
       {
           if (!string.IsNullOrEmpty(varname))
           {
              return true;
           }
           else
           {
               return "Error";
           }
       }
       catch (Exception)
       {
           throw;
       }
       return value;
   }

This is a call from m lua script.
a,error = setvar("Hi");
I want to return multiple values from my c# fucntion to lua call.

Any Suggestion Plz!