C#

<connectionStrings>
   <add name="DEVConnectionString" connectionString="Data Source=dev2008;Initial Catalog=DEV;Integrated Security=True"
     providerName="System.Data.SqlClient" />
 </connectionStrings>

 base(ConfigurationManager.ConnectionStrings["DEVConnectionString"].ConnectionString, mappingSource)

The app.configuration file looks like the following:
 <connectionStrings>
    <add name="DEVConnectionString" connectionString="Data Source=dev2008;Initial Catalog=DEV;Integrated Security=True"
      providerName="System.Data.SqlClient" />
  </connectionStrings>

class Population{
       public void DuplicatePopulation(Population thatPop){
         x=thatPop.x;
       }
       public int x;
};
class GA{
public GA(){
       InitPop=new Population();
       CrossOverPop=new Population();
}
public Population FindPopID(int ID){
       switch(ID){
         case 1:return InitalPop;break;
	 case 2:return CrossOverPop;break;
	 default:break;
       }
       return InitialPop;//default
}
public void DuplicatePopulation(int FromID,int ToID){
	Population FROM,TO;
	FROM=FindPopID(FromID);
	TO=FindPopID(ToID);		         
        TO.DuplicatePopulation(FROM);
}
Population InitialPop,CrossOverPop;
};

class MainClass{
public void main(string[] args){
        GA GeneticAl=new GA();
        
        //Process here

        GeneticAl.DuplicatePopulation(1,2);
};

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